Patent ID: 6274761
Filing Date: 2001-08-14
Classification: C07C,C11D,D06L,D21H

Abstract:
A process for the preparation of sulphonated distyryl-biphenyl compounds of formula: ##STR17##in which R.sub.1 and R.sub.2, independently, are hydrogen, C.sub.1 -C.sub.5 -alkyl, C.sub.1 -C.sub.5 -alkoxy or halogen, and M represents Li, K, an alkaline earth metal, ammonium, a mono-, di- or trialkylammonium or a tetraalkylammonium, all containing 1-4 carbon atoms in each alkyl group; a mono-, di- or tri (C.sub.2 -C.sub.4)alkanolammonium, morpholinium, piperidinium or pyrrolidinium characterized by, firstly, reacting a compound of formula ##STR18##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 immiscible 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; a mono-, di- or tri(C.sub.2 -C.sub.4)alkanolamine, morpholine, piperidine or pyrrolidine.