Ciba Specialty Chemicals Corporation

Brigitte Gerhild Sereinig

Peter Rohringer

Victor Paul Eliu

Julia V&ouml;lkel

Roger Wolfgang Basler

A process for the preparation of sulphonated distyryl-biphenyl compounds of formula (1), in which R,and R,, independently, are hydrogen, C,-C,-alkyl, C,-C,-alkyl or halogen, and M represents Li, K, an alkaline earth metal or ammonium, characterized by, firstly, reacting a compound of formula (2) with a di- or trialkylamine containing 6-12 carbon atoms in each alkyl group, in a two-phase system consisting of strong aqueous mineral acid and a water immisicible organic solvent and, secondly, reacting the resulting lypophilic ammonium salt with LiOH, KOH, an alkaline earth metal hydroxide, ammonia, a mono-, di- or trialkylamine or a tetraalkylammonium hydroxide, all containing 1-4 carbon atoms in each alkyl group; mono-, di- or tri(C,-C,)alkanolamine, morpholine, piperdine or pyrrolidine.

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Grenzach-Wyhlen, Germany

Brigitte Gerhild Sereinig