Process for the preparation of phosphonic acid dihalides

Details Process for the preparation of phosphonic acid dihalides Process for the preparation of phosphonic acid dihalides

1973-11-13

1976-08-03

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2604651, 260488F, C07F 942

Patent

active

039729230

ABSTRACT:
Process for preparing phosphonic acid dihalides of the formula ##EQU1## wherein R is alkyl of 1 to 18 carbon atoms, cycloalkyl of 4 to 8 carbon atoms, alkenyl of 2 to 18 carbon atoms, phenyl, phenalkyl or alkyl-phenyl of 7 to 8 carbon atoms, phenyl, phenalkyl or alkyl-phenyl of 7 to 8 carbon atoms, all radicals R optionally being substituted by chlorine, bromine, cyano or lower acyloxy, and wherein X is halogen such as 2-chloroethane phosphonic acid dichloride, by reacting phosphonic or thio-phosphonic acids of the formula ##EQU2## wherein Y is oxygen or sulfur, their salts or functional derivatives, with acid halides of the formula

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