Process for the preparation of alkylphosphonous acid diesters an

Details Process for the preparation of alkylphosphonous acid diesters an Process for the preparation of alkylphosphonous acid diesters an

1990-04-05

1992-07-07

Lee, Mary C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

C07F 946, C07F 948

Patent

active

051284952

ABSTRACT:
The said compounds are prepared by reaction of trialkyl phosphites with phosphorus trichloride and/or dichlorophosphinous acid monoalkyl esters at -20 to +100.degree. C. and direct subsequent reaction with alkylmagnesium chloride or alkylmagnesium bromide at -60 to +50.degree. 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.

REFERENCES:
patent: 2903475 (1959-08-01), Hardwitz
patent: 4032602 (1977-06-01), Mazour et al.
patent: 4079103 (1978-03-01), Mazour
patent: 4118435 (1978-10-01), Kleinstuck et al.
Houben-Weyl: "Methoden der organischen Chemie", 4. Aufalge, Band x 11, Teil 2, 1964, hrsg. von E. Muller, p. 18, paragraph 3; pp. 50-51, paragraph 8.
Journal of the Chemical Society, Section C: Organic Chemistry, 1968, pp. 839-842; A. D. Brown et al.: "Structural effects in reactions of organo phosphorous compounds. II. Reaction of Grignard reagents with phosphonic dichlorides".
Chemical Abstracts, vol. 52, 1958, No. 8070c.
Chemical Abstracts, vol. 54, 1960, No. 18340g.
Chemical Abstracts, vol. 55, 1961, No. 14288f.
Kabachnik, M. I. et al., Chem. Abstr. 52, 8070c (1958).
Sander, M. Chem. Abstr. 54, 18340g (1960).
Kabachnik, M. I. et al., Chem. Abstr. 55, 14288f (1960).

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