Patent GB-618073-A (GB)
Title: Process for the production of n-arylthiazolinium quaternary salts and of dyes therefrom and for the incorporation of n-arylthiazolinium dyes in photographic emulsions
IPC: C09B23/02
Filed: 1946-09-06
Abstract: An N-arylthiazolinium quaternary salt of the general formula <FORM:0618073/IV(b)/1> wherein R is an aryl radical of the benzene or naphthalene series, is prepared by condensing an N-thioacetylarylamine of formula R-NH-CS-CH3 with ethylene dibromide. The bromide may be converted into the perchlorate or iodide by treatment with NaClO4 or KI, and the iodide so produced may be converted into the chloride as described in Specification 533,238. N-Thioacetylaniline, N-thioacetyl-a -and -b -naphthylamine, N - thioacetyl - p - chloraniline, N-thioacetyl-p-methoxyaniline, N-thioacetyl-o-, -m- and -p-toluidine, N-thioacetyl-p-cyanoaniline and N - thioacetyl - p - dimethylaminoaniline may be used. 2-Methyl-3-phenyl-thiazolinium perchlorate is prepared by fusing together thioacetanilide and ethylene dibromide, adding sodium acetate and further heating, dissolving in water, and adding aqueous sodium perchlorate.  2 - Methyl-3-(a  - naphthyl) - thiazolinium perchlorate, 2 - methyl - 3 - (b  - naphthyl) - thiazolinium bromide and perchlorate, and 2-methyl-3-(p-chlorophenyl)-thiazolinium perchlorate are similarly prepared.  2-Arylaminovinyl derivatives of N-arylthiazolinium quaternary salts are prepared by condensing 2-methyl-N-arylthiazolinium quaternary salts with a diarylformamidine.  2-(b -Anilinovinyl) - 2 - phenylthiazolinium perchlorate is prepared by fusing together 2-methyl-3-phenylthiazolinium perchlorate and diphenylformamidine.  2 - (b  - Anilinovinyl)-3-(a  - naphthyl)-thiazolinium perchlorate is similarly prepared.ALSO:2-Arylaminovinyl derivatives of N-arylthiazolinium quaternary salts are prepared by condensing 2-methyl-N-arylthiazolinium quarternary salts with a diarylformamidine.  2-(b -Anilinovinyl) - 2 - phenylthiazolium perchlorate is prepared by fusing together 2-methyl-3-phenylthiazolinium perchloriate and diphenylformamidine. 2-(b -Anilinovinyl)-3-(a -naphthyl)-thiazolinium perchlorate is similarly prepared.  Styryl dyes are produced by condensing 2-methyl - N - arylthiazolinium quaternary salts with p-dialkylaminobenzaldehydes.  2-(p-Dimethylaminostyryl) - 3 - phenylthiazolinium per chlorate is prepared by refluxing together 2-methyl - 3 - phenylthiazolinium perchlorate, p-dimethylaminobenzaldehyde, ethyl alcohol, and piperidine. 2-(p-Dimethylaminostyryl)-3-(a  - naphthyl) - thiazolinium perchlorate and 2 - (p - diethylaminostyryl - 3 - phenylthiazolinium perchlorate are similarly prepared.  Symmetrical dithiazolinocarbocyanine dyes are prepared by condensing one molecular proportion of an alkyl orthoformate with substantially two molecular proportions of a 2-methyl-N-arylthiazolinium quaternary salt.  3 : 31-Diphenylthiazolinocarbocyanine perchlorate is prepared by refluxing together 2-methyl-3-phenylthiazolinium perchlorate, ethyl orthoformate, and piperidine.  3 : 31-Di-(a -naphthyl)-thiazolinocarbocyanine perchlorate is similarly prepared. Thiazolinomerocarbocyanine dyes are prepared by condensing a 2-(b -anilinovinyl) deriviative of an N-arylthiazolinium p  quaternary salt with a heterocyclic organic compound containing a -CO-CH2-Q- group in the heterocyclic ring, Q being O, S, CO, or -NR wherein R is H or an alkyl or aryl group).  3 - Ethyl - 5 - [(3 - phenyl - 2 - thiazolinylidene)-ethylidene] - 2 - thio - 2 : 4 - oxazoledione is prepared by refluxing together 2-(b -anilinovinyl) - 3 - phenylthiazolinium perchlorate, 3 - ethyl - 2 - thio - 2 : 4 - oxazoledione, ethyl alcohol, and triethylamine.  3-Ethyl-5-[(3-a -naphthyl - 2 - thiazolinylfdene) - cthylidene] - 2-thio-2 : 4-oxazoledione is similarly prepared.