Patent ID: 7196228
Filing Date: 2007-03-27
Classification: B33Y,C07F,C08F,G03F

Abstract:
1. Process for the preparation of dimer or multimer forms of BAPO compounds of the formula I, wherein R R Q is a di- tri or tetravalent arylene residue; n is 1–4, m is 0–2, n+m is 2, 3 or 4, characterized in that (n+m) equivalents of a dimetalated-phosphine R to form an intermediate of the formula III the intermediate III is then reacted with (n+m) equivalents of a further carboxylic acid halogenide (R 2 —CO-Hal) to form dimer or multimer forms of bisacylphosphine-intermediates of the formula IV said phosphines IV are then oxidized to form phosphine oxides of the formula I, wherein M is Li, Na or K.