| abstract |
NEW MATERIAL:Leuco compounds of the formula, wherein R 1 , R 2 , R 3 , R 4 are each a lower alkyl; R 5 is H, a lower alkyl. n EXAMPLE: Di-(p-dimethylaminostyryl)-p-methylphenylsulfonylmethane. n USE: Color formers for pressure-sensitive recording materials, thermal recording materials and thermal transfer recording materials. n PREPARATION: The carbonyl group of bis(p-dimethylaminobenzal)acetone is reduced in the presence of lithium aluminum hydride, and perchloric acid is added thereto to form bis(p-dimethylaminostyryl)carbenium perchlorate. The perchlorate is reacted with sodium p-toluenesulfinate to give bis(p-dimethylaminostyryl)-p- methylphenylsulfonylmethane. n COPYRIGHT: (C)1985,JPO&Japio |