Sulphonated distyryl benzenes prodn - by condensing 4-methylstilbenes and sulphoanils in presence of strong base

摘要

Preparing 1,4-distyrylbenzenes (I) comprises reacting a 4-methyl stilbene (II) with anil (III) in presence of a strongly basic alkali cpd. in a strongly polar neutral-to-basic org. solvent. (rings, A, B, and C are opt. substd. by nonchromophoric gps. and 1 of A and C has a SO3M substit M=H or salt-forming cation; ring A can also represent naphthalene; Ar=opt. substd. aryl). Yields of (I) are food. (I) are optical brighteners for high mol. wt. org. materials e.g. for incorporation into detergent compsns or spinning melts.