Process for making phosphonic acid dichlorides

Details Process for making phosphonic acid dichlorides Process for making phosphonic acid dichlorides

C - Chemistry, Metallurgy

07

F

260/537.8

C07F 9/42 (2006.01)

Patent

CA 1277334

PROCESS FOR MAKING PHOSPHONIC ACID DICHLORIDES ABSTRACT OF THE DISCLOSURE Phosphonic acid dichlorides of the general formula I Image (I) are made by reacting thionyl chloride with a phosphonic acid dialkylester of the general formula II Image (II) and using, as the catalyst, a compound of the general for- mulae III, IV or V R1R2R3R4PX (III) R1R2R3P (IV) R1R2R3PO (V) in which R1, R2 and R3 each stand for identical or dif- ferent alkyl groups or aryl groups having from 1 to 8 car- bon atoms, X stands for chlorine or bromine, R4 has the same meaning as R1 through R3 or stands for chlorine or bromine.

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