Patent GB-1060561-A (GB)
Title: Light-sensitive layers
IPC: G03C1/73
Filed: 1964-01-30
Abstract: 2,6 - Di - p - methoxyphenyl - 4 - phenylpyrylium fluoroborate, 2,6 - di - p - methoxyphenyl - 4 - phenyl - thiapyrylium fluoroborate, 2,6 - di - p - ethylphenyl - 4 - methoxyphenyl pyrylium fluoroborate, 4 - p - acetoxyphenyl-2,6 - diphenyl thiapyrylium fluoroborate, 2,3,4,6 - tetraphenyl pyrylium fluoroborate, 2,6-diphenyl - 4 - (o - methoxyphenyl) pyrylium fluoroborate, 2 - (2 - naphthyl) - 4,6 - diphenylpyrylium fluoroborate, 2 - (1 - naphthyl) - 4,6-diphenyl - pyrylium fluoroborate, 2,3,4,6-tetraphenyl thiapyrylium fluoroborate and 2,4-di - p - methoxyphenyl - 6 - methoxystyryl pyrylium fluoroborate are prepared by reacting an appropriately substituted aromatic aldehyde and an appropriately substituted acetophenone in the presence of boron trifluoride etherate followed by treatment with sodium sulphide in the case of the thiapyrylium salts. 2-(p-Amyloxystyryl) - 4,6 - diphenyl pyrylium perchlorate, 4,6 - diphenyl - 2 - (styrylvinyl) pyrylium perchlorate and 4,6 - diphenyl - 2 - styryl pyrylium perchlorate are prepared by reacting 2-methyl4,6-diphenyl pyrylium perchlorate with an appropriately substituted aromatic aldehyde. 2,6 - Di - m - nitrophenyl - 4 - p - nitrophenyl pyrylium perchlorate is prepared by reacting 2,4,6-triphenyl pyrylium fluoroborate with nitric acid and subsequent reaction with phosphorus oxychloride.  2,6 - Bis (p - ethylphenyl) - 4 - (p - pentoxyphenyl) - thiapyrylium perchlorate is prepared by reacting 4-pentoxy benzaldehyde with 4-ethylacetophenone in the presence of phosphorus oxychloride followed by reaction with sodium sulphide.  4 - (p - n-Amyloxyphenyl) - 2,6 bis - (p - ethylphenyl) thiapyrylium perchlorate is prepared by reacting 4-amyloxybenzaldehyde with 4-ethyl acetophenone in the presence of perchloric acid followed by reaction with sodium sulphide. 2-Phenyl benzo (b) pyrylium chloroferrate is prepared by condensing salicylaldehyde with acetophenone in the presence of boron trifluoride and ferric chloride.  7 - Hydroxy - 4 - (p - methoxystyryl) - 2 - phenyl benzo (b) pyrylium chloride is prepared by condensing resorcinol with benzoyl acetone in the presence of HCl and heating the product with anisaldehyde. 4-(4-Dimethylaminophenyl) - 2,6 - diphenyl pyrylium perchlorate is prepared by condensing p-di-methylamino benzaldehyde with acetophenone in the presence of sulphuric acid followed by treatment with alcoholic perchloric acid. 2,4-Bis (4 - ethylphenyl) - 6 - (2,6 - diphenyl thia - 4-pyranylidene methyl) pyrylium perchlorate is prepared by reacting p-ethyl acetophenone with acetic anhydride and condensing the product with 2,6-diphenyl-thia-4-pyrone in the presence of perchloric acid.  2 - (6 - Phenyl hexatrienyl-1,3,5) - 4,6 - diphenyl pyrylium perchlorate is prepared by condensing 4-formyl-1-phenyl-2,4-butadiene with acetophenone in the presence of boron trifluoride etherate followed by treatment with perchloric acid.  2 - (4 - Dimethylamino styryl) - 4,6 - diphenyl pyrylium sulpho acetate is prepared by condensing acetophenone with dimethylamino benzaldehyde in the presence of acetic anhydride and sulphuric acid.  S-2-Hydroxy ethyl isothiouronium trichloroacetate is prepared by reacting 2-chloro ethanol and thiourea and then reacting the product with trichloroacetic acid. 2,6 - Bis (4 - chlorocarbomethoxyphenyl) - 4 - phenyl pyrylium fluoroborate is prepared by condensing p-b -carbomethoxy acetophenone with benzaldehyde in the presence of boron trifluoride etherate and heating the product with thionyl chloride. 2 - (p - n Amyloxy phenyl) - 4,6 - diphenyl pyrylium - perchlorate is prepared from the corresponding fluoroborate by metathesis with perchloric acid.  2 - p - Methoxyphenyl - 4,6-diphenyl thiapyrylium fluoroborate and 2 p-methoxy phenyl - 4,6 - diphenyl pyrylium fluoroborate are prepared as described in Specification 1,023,377 but using boron trifluoride etherate as the condensing agent.