Process for the preparation of vinylphosphonic acid dichloride a

Details Process for the preparation of vinylphosphonic acid dichloride a Process for the preparation of vinylphosphonic acid dichloride a

1982-03-18

1984-01-24

Trousof, Natalie

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07F 942

Patent

active

044276028

ABSTRACT:
Process for the preparation of vinylphosphonic acid dichloride and 2-chloroethanephosphonic acid dichloride, by heating a 2-acetoxyethanephosphonic acid dialkyl ester of the general formula ##STR1## wherein R denotes alkyl groups having 1 to 4 carbon atoms, in the presence of acid or basic catalysts at 150.degree.-270.degree. C. with elimination of an alkyl acetate, reacting the resulting reaction mixture with water at temperatures between 130.degree.-230.degree. C. while simultaneously distilling off the alcohol formed, and reacting the crude vinylphosphonic acid thus formed with phosgene in the presence of catalysts and also in the presence of phosphonic acid dichlorides.

REFERENCES:
patent: 4013715 (1977-03-01), Finke et al.

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