Process for making alkyl or arylthiophosphonic acid dichlorides

Details Process for making alkyl or arylthiophosphonic acid dichlorides Process for making alkyl or arylthiophosphonic acid dichlorides

C - Chemistry, Metallurgy

07

F

260/537.8

C07F 9/34 (2006.01) C07F 9/42 (2006.01)

Patent

CA 1181091

PROCESS FOR MAKING ALKYL OR ARYLTHIOPHOSPHONIC ACID DICHLORIDES ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for making alkyl or arylthiophosphonic acid dichlorides by reacting alkyl or aryl- dichlorophosphanes with sulfur at a temperature above the melt- ing point of sulfur and in the presence of a catalyst. More particularly, the reaction is effected at a temperature between the melting point of sulfur and the boiling point of the resulting alkyl or arylthiophosphonic acid dichloride and in the presence of a catalyst of the following general formula I or II Image (II) in which R1, R2, R3 and R4 stand for identical or different alkyl, aryl, alkaryl or aralkyl groups having from 1 to 22 carbon atoms and A stands for the anionic group of an orga- nic or inorganic acid.

407534

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