Process for the preparation of halo-methylphosphinic acid halides
AssigneeHoechst Aktiengesellschaft
InventorHans-Jerg Kleiner
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Abstract
A process for the preparation of halo-methylphosphinic acid halides of the formula I ##EQU1## where R.sub.1 is alkyl, aralkyl or aryl having from 1 to 18 carbon atoms, and X is halogen, which comprises reacting phosphinic acid derivatives of the formula II ##EQU2## where R.sub.1 is as defined above and R.sub.2 is alkyl having from 1 to 18 carbon atoms optionally being substituted by halogen, hydrogen or a monovalent cation, with acid halides of the formula III (co).sub.n X.sub.2 (III) where n is 1 or 2 and X is halogen.
Claims6
A process for the preparation of a halomethylphosphinic acid halide of the formula ##EQU5## in which R.sub.1 is alkyl of from 1 to 18 carbon atoms, cycloalkyl of from 5 to 8 carbon atoms phenyl or phenylalkyl of 7 to 10 carbon atoms and X is halogen, which comprises reacting a phosphinic acid derivative of the formula ##EQU6## in which R.sub.1 is as defined above and R.sub.2 is hydrogen, a monovalent cation, or alkyl of from 1 to 18 carbon atoms optionally substituted by halogen, with a reactive acid halide of the formula
- (CO).sub.n X.sub.2
- in which n is 1 or 2 and X is halogen
Dependencies are inferred from the claim text.