Process for the preparation of alkylphosphonous acid...

C - Chemistry – Metallurgy – 07 – F

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C07F 9/46 (2006.01) C07F 9/48 (2006.01)

Patent

CA 2014002

Process for the preparation of alkylphosphonous acid diesters and/or dialkylphosphinous acid esters The said compounds are prepared by reaction of trialkyl phosphites with phosphorus trichloride and/or dichloro-phosphinous acid monoalkyl esters at -20 to +100°C and direct subsequent reaction with alkylmagnesium chloride or alkylmagnesium bromide at -60 to +50°C and subsequent separation of the desired compounds from the distillate of the volatile compounds. Dialkyl alkylphosphonites and monoalkyl dialkylphosphinites are thus obtained without troublesome and expensive purification of intermediates. The phosphorus-containing esters produced are, for their part, useful intermediates, for example for the preparation of flame retardants and plant protection agents.

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