Patent ID: 6211397
Filing Date: 2001-04-03
Classification: C07F

Abstract:
A process for the preparation of .alpha.-chloromethylene-triorganylphosphorane derivatives of the formula I ##STR13##in which the radicals R can be the same or different and denote C-organic substituents and A stands for cyano or a group CO-B where B is a C-organic or O-organic radical which has from 1 to 12 carbon atoms and is inert under chlorination conditions, by chlorination of phosphoranes of formula II ##STR14##with chlorine, wherein the chlorination is carried out in the presence of an alkali metal hydroxide as hydrogen chloride acceptor and the chlorine and said base are fed to the reaction mixture concurrently but separately at the rates at which they are consumed, such that the pH does not rise above 9 throughout the reaction.