Tri:aryl phosphite prodn. from phosphorus tri:halide - and aromatic hydroxy cpd. in presence of nitrogen heterocycle as catalyst

摘要

Prodn. of triarylphosphites P(OR)3 (I) (R is aryl opt. substd. by one or more opt. branched alkyl or by cycloalkyl, aryl or aralkyl) comprises reacting a P trihalide with ROH in the presence of 0.005-10 mole % (on ROH) of an aromatic N-contg. heterocycle as catalyst. Reaction is at 30-250 deg.C, opt. in presence of a solvent. The catalyst can be used as a salt derived from an inorganic acid or an organic sulphonic, phosphonic or carboxylic acid. (I) are (co)stabilisers for protecting polymers, e.g. polyolefins, against light- and heat-induced deterioration.