Regenerating conjugated diolefin dimerisation catalysts - contg. palladium and triaryl phosphine by forming insoluble complex with triaryl phosphine and partial oxidn.

摘要

Regeneration of conjugated diolefin dimerisation catalysts (I) contg. Pd and triaryl phosphine, esp. PPh3, takes place by bonding Pd with triaryl phosphine to form a difficultly soluble complex, (II), pref. a tetrakis (triaryl phosphine)-Pd; separating the pptd. (II) and converting (II) by partial oxidn. into an active, easily soluble form. (I) is pref. used for dimerisation of butadiene to form octatriene-1,3,7-and in presence of alcohols, phenols, carboxylic acids or amines, for prepn. of 1-alkoxy-octadiene-2,7, 1-phenoxyoctadiene-2,7, 1-acyl-octadiene-2,7, or opt. N-alkyl-substd 1-amino-octadiene-2,7. A simple process is provided for re-converting a spent catalyst into a highly active condition.