A new efficient synthesis of the stilbenoid laser dyes BPS and Stilbene i by palladium-catalyzed coupling of ethene with bromoarenes

Article abstract of DOI:10.1002/cber.19971300905

The palladium-catalyzed coupling of ethene with 4-bromobi phenyl and 4′-bromo-4-biphenylsulfonic acid permits a facile one-pot preparation of the laser dyes (E)-4,4′-diphenylstil bene (BPS, 3) and bis (trie thylammonium) (E)-4,4′-diphenyl-stilbene-4″,4?-disulfonate (6) in diastereomerically pure form on a multigram scale, with yields of 69 and 64%, repectively. The latter can easily be transformed to its dipotassium salt 7, the Stilbene I dye. VCH Verlagsgcscllschaft mbH,.