Triazinyl-benzofluorans

Abstract

Fluorans useful as color precursors, particularly in the art of carbonless duplicating are normally colorless and are represented by the structural formula ##STR1## wherein R represents non-tertiary alkyl of one to four carbon atoms; R 1 represents hydrogen or non-tertiary alkyl of one to four carbon atoms; R 2 and R 3 represent chlorine or one of the groups --NR 4 --(lower-alkylene)--N(R 5 )(R 6 ) or --NR 4 --(lower-alkylene)--N + (R 7 )(R 8 )(R 9 )An - In which R 4 , R 5 and R 6 represent hydrogen or non-tertiary alkyl of one to four carbon atoms; R 7 and R 8 represent non-tertiary alkyl of one to four carbon atoms; R 9 represents non-tertiary alkyl of one to four carbon atoms, benzyl or benzyl substituted in the benzene ring by one or two of halo or alkyl of one to three carbon atoms; and An represents an anion.

Claims

We claim: 1. A compound having the formula ##STR4## where R represents non-tertiary alkyl of one to four carbon atoms; R 1 represents hydrogen or non-tertiary alkyl of one to four carbon atoms; R 2 and R 3 represent chlorine or one of the groups ##STR5## in which R 4 , R 5 and R 6 represent hydrogen or non-tertiary alkyl of one to four carbon atoms; R 7 and R 8 represent non-tertiary alkyl of one to four carbon atoms; R 9 represents non-tertiary alkyl of one to four carbon atoms, benzyl or benzyl substituted in the benzene ring by one or two of halo or alkyl of one to three carbon atoms; and An represents an anion selected from the group consisting of halides, hydroxy, alkanoates, nitrate, phosphate, alkylsulfates and arylsulfates. 2. A compound according to claim 1 where R 2 and R 3 are each chlorine and R and R 1 have the same respective meanings given in claim 1. 3. The compound according to claim 2 where R is ethyl; and R 1 is hydrogen. 4. A compound according to claim 1 where R 2 and R 3 are each --NR 4 --(lower-alkylene)--N(R 5 )(R 6 ) and R, R 1 , R 4 , R 5 and R 6 each have the same respective meanings given in claim 1. 5. The compound according to claim 4 where R is ethyl; R 1 and R 4 are each hydrogen; R 5 and R 6 are each methyl; and lower-alkylene is 1,3-propylene. 6. A compound according to claim 1 where R 2 and R 3 are each --NR 4 --(lower-alkylene)--N + (R 7 )(R 8 )(R 9 ) An - and R, R 1 , R 4 , R 7 , R 8 , R 9 and An each have the same respective meanings given in Claim 1. 7. The compound according to claim 6 where R is ethyl; R 1 and R 4 are each hydrogen; R 7 and R 8 are each methyl; R 9 is benzyl; and lower-alkylene is 1,3-propylene.
BACKGROUND OF THE INVENTION a. Field of the Invention This invention relates to 2'-(4,6-disubstituted-s-triazin-2-yl)amino-9'-dialkylamino[1'a,4'a]benzofluorans useful as color precursors, particularly in the art of carbonless duplicating systems as, for example, pressure sensitive and thermal systems and to processes for preparing said 2'-triazinyl-amino-substituted-9'-dialkylamino[1'a,4'a]benzofluorans. B. Description of the Prior Art Several classes or organic compounds of widely diverse structural types are known to be useful as colorless precursors for carbonless duplicating systems. Among the more important classes, there may be named phenothiazines, for example, benzoyl leuco methylene blue; phthalides, for example, crystal violet lactone; fluorans, for example, 2'-anilino-6'-diethylaminofluoran and 2'-dibenzylamino-6'-diethylaminofluoran; and various other types of colorless precursors currently employed in commercially accepted carbonless copy systems. Moriga and Oda (Univ. Kyoto, Japan) in Kogyo Kagaku Zasshi 67 (7), 1054-8 (1964) [Chemical Abstracts 62: 2852a (1965)] describe the preparation and properties of a 3,3-bis(4-dimethylaminophenyl)phthalide which is substituted in the benzene ring of the phthalide moiety by a 4,6-dichloro-s-triazin-2-ylamino group. The compound is described as producing a green image when developed on bentonite in a simulated carbonless duplicating application. However, this prior art compound exhibits a number of deficiencies when employed in such a system which render it generallly unsuitable for application in commercially feasible copy systems in light of the industry's standards for colorless precursors. Thus, its rate of color formation, upon contact with an electron withdrawing media such as an acidic clay or phenolic resin has been found to be rather slow. The intensity of tinctorial strength of the developed color produced by the reference compound has been found to be less than that generally found economically acceptable in the art when used within the concentrations usually employed in carbonless copy systems. Further, the solubility of the prior art compound in solvents regularly used in the copy system art for dissolving the dyes for microencapsulation is below that generally required to provide sufficient concentration of the dye to obtain satisfactory tinctorial strength in the developed form. Possibly the most important deficiency of the phthalide of Moriga and Oda is the low susceptibility to copiability of their color-developed form in standard copying machines, for example, a Xerox copier. By contrast, the compounds of this invention have been found to overcome the deficiencies of the prior art compound in that they proved to have a rapid rate of color formation on contact with acidic developing media; they have a good to excellent tinctorial strength to weight ratio; they are satisfactorily soluble in the usual microencapsulating solvents; and their developed color form is highly copiable in duplicating machines. SUMMARY OF THE INVENTION In one of its composition of matter aspects, the invention relates to certain 2'-(4-R 2 -6-R 3 -s-triazin-2 -yl)NR 1 -9'-N(R) 2 [ 1'a,4'a]benzofluorans which are final products useful as colorless precursors in carbonless duplicating systems. In a second composition of matter aspect, the invention relates to certain 2'-(4,6-dichloro-s-triazin-2 -yl)NR 1 -9'-N(R) 2 [ 1'a,4'a] benzofluorans which, in addition to having the same utility as the final products, are useful as intermediates for the preparation of other final products of the invention. In one of its process aspects, the invention relates to a process for preparing the 2'-(4,6-dichloro-s-triazin-2 -yl)-NR 1 -9'-N(R) 2 [ 1'a, 4'a]benzofluorans which comprises interacting the appropriate 2'-NHR 1 -9'-N(R) 2 [1'a,4'a]benzofluoran with cyanuric chloride. In a second of its process aspects, the invention relates to a process for preparing the 2'-(4-R 2 -6-R 3 -s-triazin-2 -yl)NR 1 -9'-N(R) 2 [ 1'a,4'a]benzofluoran wherein each of R 3 and R 4 is a substituted amino group which comprises interacting the appropriate 2'-(4,6-dichloro-s-triazin-2 -yl)NR 1 -9'-N(R) 2 [ 1'a, 4'a]-benzofluoran with approximately two molecular proportions of the appropriate amine. In a third of its process aspects, the invention relates to a process for the preparation of a quaternary ammonium salt of a 2'-(4-R 2 -6-R 3 -s-triazin-2 -yl)NR 1 -9'-N(R) 2 [ 1'a,4'a]-benzofluoran in which one or both of R 3 and R 4 are substituted amino groups having within the substituting group a quaternizable nitrogen atom which comprises interacting the appropriate said basic amino compound with an appropriate quaternizing agent, for example, benzyl chloride. DETAILED DESCRIPTION INCLUSIVE OF THE PREFERRED EMBODIMENTS More specifically, this invention, in its composition of matter aspect, resides in the novel 2'-(4-R 2 -6-R 3 -s-triazin-2 -(yl)NR 1 -9'-N(R) 2 [ 1'a,4'a]benzofluorans which are useful as colorless precursors in the art of carbonless duplicating, and which are represented by the structural formula ##STR2## Formula I where R represents non-tertiary alkyl of one to four carbon atoms; R 1 represents hydrogen or non-tertiary alkyl of one to four carbon atoms; R 2 and R 3 represent chlorine or one of the groups ##STR3## in which R 4 , R 5 and R 6 represent hydrogen or non-tertiary alkyl of one to four carbon atoms; R 7 and R 8 represent non-tertiary alkyl of one to four carbon atoms; R 9 represents non-tertiary alkyl of one to four carbon atoms, benzyl or benzyl substituted in the benzene ring by one or two of halo or alkyl of one to three carbon atoms; and An represents an anion. In the first particular embodiment in accordance with its composition of matter aspect, the invention sought to be patented resides in the novel 2'-(4,6-dichloro-s-triazin-2 -yl)-NR 1 -9'-N(R) 2 [ 1'a,4'a]benzofluorans of Formula I wherein R 2 and R 3 are each chlorine and R and R 1 each have the same respective meanings indicated in relation for Formula I. In a second particular embodiment in accordance with its composition of matter aspect, the invention sought to be patented resides in the novel 2'-(4-R 2 -6-R 3 -s-triazin-2 -yl)NR 1 -9'-N(R) 2 [ 1'a,4'a]benzofluorans of Formula I where R 2 and R 3 are each --NR 4 --(lower-alkylene)-- N(R 5 )(R 6 ) and R, R 1 , R 4 , R 5 and R 6 each have the same respective meanings indicated in relation to Formula I. In a third particular embodiment in accordance with its composition of matter aspect, the invention sought to be patented resides in the novel 2'-(4-R 2 -6-R 3 -s-triazin-2 -yl)NR 1 -9'-N(R) 2 [ 1'a,4'a]benzofluorans of Formula I in which R 2 and R 3 are each --NR 4 --(lower-alkylene)--N + (R 7 )(R 8 )(R 9 ) An - and R, R 1 , R 4 , R 7 , R 8 , R 9 and An each have the same respective meanings given in relation to Formula I. In one of its process aspects, the invention sought to be patented resides in the process for the preparation of the novel 2'-s-triazin-2ylamino-9'-dialkylamino[1'a,4'a]benzofluorans represented by Formula I in which R 2 and R 3 are each chloride which comprises interacting an appropriate 2'-NHR 1 -9'-N(R) 2 [ 1'a,4'a]benzofluoran with approximately one molecular proportion of cyanuric chloride wherein R and R 1 each have the same respective meanings given in relation to Formula I. In a second process aspect, the invention sought to be patented resides in the process for the preparation of the novel 2'-s-triazin-2-ylamino-9'-dialkylamino[1'a,4'a]benzofluorans represented by Formula I in which R 2 and R 3 are each --NR 4 --(lower-alkylene)--N(R 5 )(R 6 ) which comprises interacting an appropriate 2'-(4,6-dichloro-s-triazin-2-yl)NR 1 -9'-N(R) 2 [ 1'a,4'a]-benzofluoran with approximately two molecular proportions of a compound having the formula Nhr 4 --(lower-alkylene)--N(R 5 )(R 6 ) wherein R, R 1 , R 4 , R 5 and R 6 each have the same respective meanings indicated in Formula I. In a third process aspect, the invention sought to be patented resides in the process for the preparation of the novel 2'-s-triazn-2-ylamino-9'-dialkylamino[1'a,4'a]benzofluorans represented by Formula I in which R 2 and R 3 are each --NR 4 --(lower-alkylene)--N + (R 7 )(R 8 )(R 9 ) An - which comprises interacting a compound represented by Formula I in which R 2 and R 3 are each --NR 4 --(lower-alkylene)--N(R 5 )(R 6 ) in which R 5 and R 6 are each non-tertiary alkyl of one to four carbon atoms with either an alkyl halide, a benzyl halide or a benzyl halide substituted in the benzene ring by one or two of halo or alkyl of one to three carbon atoms and wherein R, R 1 R 4 , R 7 , R 8 , R 9 and An each have the same respective meanings given in Formula I. As used herein, the term "halo" includes bromo, chloro, fluoro and iodo. Similarly, the term "halide" includes bromide, chloride, fluoride and iodide. As used herein, the term "non-tertiary alkyl" means saturated, aliphatic hydrocarbon groups, either straight or branched-chain, containing from one to four carbon atoms, and includes methyl, ethyl, propyl, isopropyl, butyl and isobutyl. As used throughout, the term "(lower-alkylene)" means a divalent saturated straight or branched-chain aliphatic radical of from two to five carbon atoms having valence bonds attached to different carbon atoms. Thus, radicals represented by the term "(lower-alkylene)" are, for example, --CH 2 CH 2 --, --CH 2 CH 2 CH 2 --, --(CH 2 ) 4 --, --(CH 2 ) 5 --, --CH(CH 3 )CH 2 --, --CH 2 --CH 2 --CH(CH 3 )--CH 2 --, --CH 2 --CH(C 2 H 5 )--CH 2 --, and the like. As used herein, the term "An" represents Anion. By Anion is meant any monovalent ion derived from an organic or inorganic acid, H Anion, by removal of an acidic hydrogen ion. Exemplary anions are, halide, hydroxy, alkanoate, nitrate, phosphate, alkylsulfate and arylsulfate. Other monovalent anions are found in the literature, for example, Hackh's Chemical Dictionary, 3rd Edition (1946) at pages 12-13, and Chemical Abstracts Vol. 56, Nomenclature, at pages 72n-80n, both incorporated herein by specific reference thereto. As is known, one anion can be changed to another anion by use of conventional ion exchange methods. The halides, i.e., chloride, bromide, fluoride and iodide and in particular chloride and bromide are particularly preferred as the anions for the colorless precursors of this invention because of the generally ready availability of the quaternizing agents containing them. However, the scope of the compounds herein described and claimed is in no way to be thereto restricted. The novel compounds represented by Formula I above are essentially colorless in the depicted lactone form. When contacted with an acidic medium, for example, silica gel, or one of the types regularly employed in carbonless duplicating systems, for example, silton clay or phenolic resins, they readily develop a colored image of good to excellent tinctorial strength. Moreover, it has been found that when the compounds of Formula I are intimately mixed with an acidic developer of the type generally employed in thermal papers, that is papers which produce a colored image when contacted with a heated stylus or heated type, for example, bisphenol A, heating of the mixture produces a red-colored material. It has also been found that when the compounds of this invention are converted to a water-soluble form, the essentially colorless water-soluble compound is substantive to cellulose, for example, paper. The rapid development of color on contact of the compounds of Formula I with silica gel, silton clay or a phenolic resin demonstrates that they are highly suitable for use as colorless precursors in pressure-sensitive carbonless duplicating systems. Their ability to readily form a deep color when heated in admixture with an acidic developer such as bisphenol A, makes them useful in thermal paper marking systems, either where an original or a duplicate copy is prepared by contacting the thermal paper with a heated stylus or heated type in any of the methods generally known in the art. The substantivity to cellulose of the water-soluble forms of the compounds of Formula I makes them effective for dyeing paper. The dyed paper then may be used for producing images as originals by contacting with an ink containing an acidic developing substance. Moreover, the dyed paper may be used in a pressure-sensitive system in which it is contacted with a matching sheet coated with microencapsulated acidic developing substance. As stated above, the compounds of Formula I are useful as color precursors, particularly in the art of carbonless duplicating systems. As with other colorless precursors currently in use in the art, the compounds are colorless under neutral or basic conditions, but become colored when contacted with an acidic material such as silica gel, a phenolic resin or an acidic clay. It is frequently desired that the images produced by such color precursors be copiable by xerographic means. A widely used color precursor is 3,3-bis(4-dimethylaminophenyl)-6-dimethylaminophthalide or, as this compound has been more simply designated, crystal violet lactone. Crystal violet lactone produces a blue image which has the advantage of being intense but which suffers the disadvantage of being poorly copiable by xerographic means. To counteract this disadvantage, other color precursors have been mixed with crystal violet lactone as described, for example, in U.S. Pat. No. 3,525,630. The images produced by the compounds of Formula I, although generally less intense in color than images produced by crystal violet lactone, are readily copiable by xerographic means. For this reason, the difficulties inherent in using mixed color precursors to achieve xerographic copiability can be avoided by using a compound of Formula I alone. The best mode contemplated by the inventors of carrying out this invention will now be described as to enable any person skilled in the art to which it pertains to make and use the same. The compounds represented by Formula I wherein R 2 and R 3 are each chlorine have dual utilities in that they are useful in the free-base form as final products of the invention having the same utility as colorless precursors and they are also intermediates both in the acid-addition salt form and in the free-base form to those final products of Formula I wherein one or both of R 2 and R 3 represent a substituted amino moiety of the type depicted in relation to Formula I. The compounds in which R 2 and R 3 are each chlorine are prepared by interacting the appropriate 2'-R 1 amino-9'-dialkylamino[1'a,4'a]benzofluoran with approximately an equimolar quantity of cyanuric chloride. The reaction is advantageously carried out in a single or a mixed solvent system consisting of aprotic and/or protic solvents. When the hydrochloride salt form of the product is desired, the reaction is carried out in the absence of alkali. When the free-base form is required, sufficient aqueous sodium hydroxide solution to neutralize the hydrochloric acid generated during the reaction is added. Particularly preferred solvent for the formation of the hydrochloric acid salt form is toluene and for the free-base form a mixture of acetone and dioxane. The reaction is best carried out in an aprotic solvent system in the temperature range of 0° C to the reflux temperature of said solvent system in the absence of alkali, and in a protic solvent system in the range of 0° to 5° C when aqueous alkali is employed. When obtained in the form of its hydrochloride salt, the 2'-(4,6-dichloro-s-triazin-2-yl)R 1 amino-9'-dialkylamino[1'a,4'a]benzofluoran is isolated by filtration followed by washing with an inert organic solvent, for example, toluene and then dried. When the dichlorotriazinyl product as the free-base is to be utilized as an intermediate to other products represented by Formula I, it is unnecessary to isolate the product and the slurry containing the intermediate in the form of the free-base may be used directly. Alternatively, the acid-addition salt form of the dichlorotriazinyl product may be converted in situ to the free-base form for interaction with the appropriate substituted amine required for the desired compound. The 2'-R 1 amino-9'-dialkylamino[1'a,4'a]benzofluorans for the preparation of the compounds of Formula I in which R 2 and R 3 are each chlorine are known compounds. Cyanuric chloride is a known compound and is commercially available. The compounds of Formula I wherein one or both of R 2 and R 3 are --NR 4 --(lower-alkylene)--N(R 5 )(R 6 ) are each prepared by essentially the same general procedure. Thus, the appropriate 2'-(4,6-dichloro-s-triazin-2-yl)R 1 amino-9'-dialkylamino[1'a,4'a]-benzofluoran is interacted with the appropriate dialkylaminoamine. When it is desired to prepare a monosubstituted compound, approximately one molecular proportion of the "side chain" is employed and when it is desired to obtain a disubstituted compound, approximately two molecular proportions of the side chain is employed. The reaction is conveniently carried out in a solvent mixture consisting of aprotic and/or protic solvents, for example, a mixture of p-dioxane and acetone in the presence of sufficient alkali to absorb the hydrochloric acid generated at a temperature in the range of 60° to 90° C, preferably at the reflux temperature of the solvent mixture. Although the reaction can be run by dissolving the appropriate 2'-(4,6-dichloro-s-triazin-2-yl)R 1 amino-9'-dialkylamino[1'a,4'a]benzofluoran in the solvent system it is generally satisfactory and preferred to use this intermediate as obtained in its own reaction mixture without prior isolation. The desired disubstituted triazinylfluoran is isolated from its reaction mixture by evaporating the solvent and triturating the residue with an appropriate inert solvent, for example, n-hexane. The quaternary ammonium compounds of Formula I wherein one or both of R 2 and R 3 represent the group --NR 4 --(lower-alkylene)--N + (R 7 )(R 8 )(R 9 ) An - are prepared by interacting an appropriate compound represented in Formula I in which one or both of R 2 and R 3 are --NR 4 --(lower-alkylene)--N(R 5 )(R 6 ) wherein R 5 and R 6 are each a non-tertiary alkyl of one to four carbon atoms with an alkyl halide or a substituted or unsubstituted benzyl halide. The quaternization is conveniently carried out either with or without solvent. Suitable solvents are to be found among polar and non-polar solvents. Among these may be mentioned the lower-alkanols, for example, isopropyl alcohol; aromatic hydrocarbons, for example, benzene and toluene; ketones, for example, acetone; and acylnitriles, for example, acetonitrile. The reaction is generally carried out in the temperature range of 30°-60° C. Illustrative of the alkyl halides useful or this conversion are, for example, methyl chloride, ethyl bromide and butyl bromide. Benzyl halides useful for the conversion are, for example, benzyl chloride, o-chlorobenzyl chloride, benzyl bromide, 2,5-dimethylbenzyl chloride, 4-bromobenzyl bromide, benzyl iodide, 3,4-dichlorobenzyl chloride, 3-fluorobenzyl chloride and the like. The reactive amine intermediates required for interaction with the appropriate 2'-(4,6-dichloro-s-triazin-2-yl)R 1 N-9'-dialkylamino[1'a,4'a]benzofluoran to obtain the compounds of Formula I are known compounds whose preparation is well-known in the prior art. The following compounds are exemplary of these reactive amine compounds useful in the practice of this invention. 3-Dimethylaminopropylamine, 3-Diethylaminopropylamine, 2-Dimethylaminoethylamine, 4-Diethylaminobutylamine, 5-Diethylaminopentylamine, 2-Diisopropylaminoethylamine, 3-Dibutylaminopropylamine, Ethylenediamine 2-Diethylaminoethylamine, and 4-Diethylamino-1-methyl-butylamine. The molecular structures of the compounds of the invention were assigned on the basis of the modes of synthesis and study of their infrared, ultraviolet and NMR spectra. The following examples will further illustrate the invention without, however, limiting it thereto. All melting points are uncorrected. EXAMPLE 1 To a stirred solution of 0.42 g of 2'-amino-9'-diethylamino[1'a,4'a]benzofluoran in 55 ml of toluene, there was added during a period of fifteen minutes at approximately 20° C, a solution of 0.20 g of cyanuric chloride in 12 ml of toluene. The solution color gradually became an intense purple. The resultant purple solution was slowly heated during a period of one hour to 70° C, maintained at 70° C for approximately two hours and was cooled to ambient temperature. The separated solid was collected by filtration and dried in vacuo at 60° C to obtain the product represented by Formula I where R is --C 2 H 5 ; R 1 is hydrogen; and R 2 and R 3 are each Cl in the form of its hydrochloride salt. This product, a pink-orange powder, decomposed at 240° C. A solution of the product in 25 percent water and 75 percent acetone spotted on silica gel, a phenolic resin or an acidic clay, develops a magenta-colored spot. EXAMPLE 2 To a stirred solution of 100 ml of acetone, 50 ml of p-dioxane and 1.0 g of 2'-amino-9'-diethylamino[1'a,4'a]benzofluoran cooled to approximately 0° C by means of an ice/salt bath, there was added during a period of one-half hour a solution of 0.44 g of cyanuric chloride in 40 ml of acetone and 0.90 ml of ten percent aqueous sodium hydroxide solution while maintaining the temperature range of 0° to 5° C. After stirring for a period of one half-hour in the temperature range of 0° to 5° C, there was added during a period of fifteen minutes 0.73 g of dimethylaminopropylamine. The resultant solution was stirred at approximately 20° C for a period of approximately one-half hour and then heated at reflux for a period of three hours. The solution was set aside at ambient temperature overnight. The solvent was evaporated from the solution at reduced pressure and the resultant oil was triturated with n-hexane which caused solid material to settle out of the solution. The solid was collected by filtration, washed with n-hexane and dried in vacuo at 60° C to obtain 1.8 g of the product represented by Formula I where R is --C 2 H 5 ; R 1 is hydrogen; and R 2 and R 3 each are --NH--(CH 2 CH 2 CH 2 )--N(CH 3 ) 2 as a pale pink powder. A benzene solution of the product spotted on silica gel, a phenolic resin or an acidic clay, develops a red color. EXAMPLE 3 To a stirred solution of 1.50 g of 2'-(4,6-bis[3-dimethylaminopropylamino]-s-triazin-2-yl)amino-9'-diethylamino[1'a,4'a]benzofluoran in 200 ml of acetone, 200 ml of p-dioxane, 25 ml toluene and 10 ml of water, there was added over a period of one-half hour a solution of 0.53 g of benzyl chloride in 10 ml of acetone. The solution color gradually changed from red to straw yellow during the benzyl chloride addition. The resulting solution was heated in the range of 40° to 50° C for a period of approximately two hours, cooled and the solvent evaporated at reduced pressure. The tar-like residue was triturated with diethyl ether and the resulting solid which settled out of the solution was collected by filtration. The solid collected was dried in vacuo at 40° C to obtain the product represented by Formula I where R is --C 2 H 5 ; R 1 is hydrogen; and R 2 and R 3 each are --NH--(CH 2 CH 2 CH 2 )--N + (CH 3 ) 2 (C 6 H 5 CH 2 ) Cl - a dark pink powder. A water solution of the product spotted on silica gel, a phenolic resin or an acidic clay, develops a red color. Proceeding by methods similar to those described in the foregoing examples, the following additional colorless precursor 2'-(4-R 2 -6-R 3 -triazin-2-yl)NR 1 -9'-N(R) 2 [ 1'a,4'a]benzofluorans of Formula I which develop to a red color when contacted with silica gel, a phenolic resin or acidic clay, were prepared or can be prepared. __________________________________________________________________________Example R R.sup.1 R.sup.2 R.sup.3__________________________________________________________________________ 4 C.sub.3 H.sub.7 H NH(CH.sub.2).sub.4 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.4 N(C.sub.2 H.sub.5).sub.2 5 C.sub.2 H.sub.5 CH.sub.3 NH(CH.sub.2).sub.5 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.5 N(C.sub.2 H.sub.5).sub.2 6 C.sub.4 H.sub.9 H Cl NH(CH.sub.2).sub.3 N(CH.sub.3).sub.2 7 C.sub.2 H.sub.5 n-C.sub.4 H.sub.9 NH(CH.sub.2).sub.3 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.3 N(C.sub.2 H.sub.5).sub.2 8 C.sub.2 H.sub.5 sec-C.sub.4 H.sub.9 Cl NH(CH.sub.2).sub.2 N(CH.sub.3).sub.2 9 CH.sub.3 C.sub.2 H.sub.5 NH(CH.sub.2).sub.2 N(i-C.sub.3 H.sub.7).sub.2 NH(CH.sub.2).sub.2 N(i-C.sub.3 H.sub.7).sub.210 C.sub.2 H.sub.5 H NH(CH.sub.2).sub.3 N(n-C.sub.4 H.sub.9).sub.2 NH(CH.sub.2).sub.3 N(n-C.sub.4 H.sub.9).sub.211 C.sub. 2 H.sub.5 C.sub.3 H.sub.7 NH(CH.sub.2).sub.2 NH.sub.2 NH(CH.sub.2).sub.2 NH.sub.212 C.sub.2 H.sub.5 H NH(CH.sub.2).sub.2 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.2 N(C.sub.2 H.sub.5).sub.213 C.sub.3 H.sub.7 H NH(CH.sub.2).sub.3 N.sup.+(CH.sub.3).sub.2 -- NH(CH.sub.2).sub.3 N.sup.+(CH.sub.3).sub.2 -- (C.sub.6 H.sub.5 CH.sub.2) Br.sup.- (C.sub.6 H.sub.5 CH.sub.2) Br.sup.-14 CH.sub.3 H NH(CH.sub.2).sub.5 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.5 N(C.sub.2 H.sub.5).sub.215 C.sub.2 H.sub.5 H NHCH(CH.sub.3)(CH.sub.2).sub.3 N-- NHCH(CH.sub.3)(CH.sub.2).sub.3 N-- (C.sub.2 H.sub.5).sub.2 (C.sub.2 H.sub.5).sub.216 CH.sub.3 CH.sub.3 NH(CH.sub.2).sub.2 N.sup.+(CH.sub.3).sub.2 (2-Cl-- NH(CH.sub.2).sub.2 N(CH.sub.3).sub.2 C.sub.6 H.sub.4 CH.sub.2) Cl.sup.-17 C.sub.2 H.sub.5 H NH(CH.sub.2).sub. 3 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.3 N.sup.+(C.sub.2 H.sub.5).su b.2 (2,5- (CH.sub.3).sub.2 C.sub.6 H.sub.3 CH.sub.2) Cl.sup.-18 CH.sub.3 H NH(CH.sub.2).sub.3 N(CH.sub.3).sub.2 NH(CH.sub.2).sub.3 N.sup.+(CH.sub.3).sub.2 (4-Br-- C.sub.6 H.sub.4 CH.sub.2) Br.sup.-19 C.sub.3 H.sub.7 H NH(CH.sub.2).sub.5 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.5 N.sup.+(C.sub.2 H.sub.5).su b.2 -- (C.sub.6 H.sub.5 CH.sub.2) I.sup.-20 C.sub.2 H.sub.5 H NH(CH.sub.2).sub.3 N.sup.+(CH.sub.3).sub.2 (2-F-- N(CH.sub.2).sub.3 N.sup.+(CH.sub.3).sub.2 (2-F-- C.sub.6 H.sub.4 CH.sub.2) Cl.sup.- C.sub.6 H.sub.4 CH.sub.2) Cl.sup.-21 CH.sub.3 n-C.sub.4 H.sub.9 NH(CH.sub.2).sub.2 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.2 N.sup.+(C.sub.2 H.sub.5).su b.2 (3,4- Cl.sub.2 --C.sub. 6 H.sub.3 CH.sub.2) Cl.sup.-22 C.sub.2 H.sub.5 H NH(CH.sub.2).sub.3 N(CH.sub.3).sub.2 NH(CH.sub.2).sub.3 N.sup.+(CH.sub.3).sub.2 (3,4- (CH.sub.3).sub.2 C.sub.6 H.sub.3 CH.sub.2) Cl.sup.-23 C.sub.2 H.sub.5 H NH(CH.sub.2).sub.4 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.4 N.sup.+(C.sub.2 H.sub.5).su b.2 (3-F-- C.sub.6 H.sub.4 CH.sub.2) Cl.sup.-24 CH.sub.3 H NH(CH.sub.2).sub.3 N(CH.sub.3).sub.2 NH(CH.sub.2).sub.3 N.sup.+(CH.sub.3).sub.2 (2,4- Cl.sub.2 C.sub.6 H.sub.3 CH.sub.2) Cl.sup.-25 C.sub.2 H.sub.5 H NH(CH.sub.2).sub.3 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.3 N.sup.+(C.sub.2 H.sub.5).su b.2 (3-Br-- C.sub.6 H.sub.4 CH.sub.2) Br.sup.-26 C.sub.2 H.sub.5 H NH(CH.sub.2).sub.2 N.sup.+(CH.sub.3).sub.2 (2-CH.sub.3 NH(CH.sub.2).sub.2 N.sup.+(CH.sub.3).sub.2 (2-CH.sub.3 -- C.sub.6 H.sub.4 CH.sub.2) Cl.sup.- C.sub.6 H.sub.4 CH.sub.2) Cl.sup.-27 CH.sub.3 H NH(CH.sub.2).sub.2 N.sup.+(C.sub.2 H.sub.5).sub.2 (CH.sub.3 ) NH(CH.sub.2).sub.2 N.sup.+(C.sub.2 H.sub.5).su b.2 (CH.sub.3) Cl.sup.- Cl.sup.-28 C.sub.2 H.sub.5 C.sub.3 H.sub.7 NH(CH.sub.2).sub.3 N(C.sub.4 H.sub.9).sub.2 NH(CH.sub.2).sub.3 N.sup.+(C.sub.4 H.sub.9).su b.3 Br.sup.-29 C.sub.2 H.sub.5 H NH(CH.sub.2).sub.5 N(C.sub.2 H.sub.5).sub.2 NH(CH.sub.2).sub.5 N.sup.+(C.sub.2 H.sub.5).su b.3 I.sup.-30 CH.sub.3 H NH(CH.sub.2).sub.2 N.sup.+(CH.sub.3).sub.2 (C.sub.3 H.sub.7) NH(CH.sub.2).sub.2 N.sup.+(CH.sub.3).sub.2 (C.sub.3 H.sub.7) Br.sup.- Br.sup.-__________________________________________________________________________ EXAMPLE 31 The utility of compounds described in the foregoing examples as color forming components in thermal copying systems was demonstrated as follows. A portion of the product of Example 3 (Formula I: R is C 2 H 5 ; R 1 is hydrogen; and R 2 and R 3 are each NH--(CH 2 ) 3 --N + (CH 3 ) 2 (C 6 H 5 CH 2 ) Cl - and an equal weight of bisphenol A were intimately mixed. A thin layer of the pinkish-white-colored powder mixture was then spread on a white porcelain tile and heated to approximately 140° C at which temperature the mixture developed a deep red color. EXAMPLE 32 Hand sheets dyed with the compound of Example 3 above (Formula I: R is C 2 H 5 ; R 1 is hydrogen; and R 2 and R 3 are each NH-(CH 2 ) 3 --N + (CH 3 ) 2 (CH 2 C 6 H 5 ) Cl - were prepared by adding a 0.5 percent aqueous solution of the compound to an aqueous slurry of a cellulosic pulp (bleached Kraft fiber). The dyestuff was exhausted onto the fiber and the sheets formed on a laboratory sheet mold. The sheet was pressed between blotting paper in a hydraulic press and then air dried. When the paper thus prepared was streaked with a toluene solution of a phenolic resin, a deep red-colored image was formed.

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