Process of making print-out images with cyanine dye bases and styryl dye bases

摘要

Alpha-tribromoacetophenone optionally substituted by at least one nitro halogen, alkyl, haloalkyl, acetyl, haloacetyl, alkyl or alkoxy radical, is prepared by direct bromination of acetophenone or the appropriate substituted acetophenone at below room temperature and under exposure to ultra-violet radiation. Specified substituted compounds are the o-, m-and p-nitro-, m- and p-bromo-, 2,5-and 3,4-dichloro-, 2,5-dimethyl- and p-tribromomethyl-tribromoacetophenones. Specifications 955,029, 959,037, 997,170 and 1,000,195 are referred to.