Process for making aryldichlorophosphanes

Details Process for making aryldichlorophosphanes Process for making aryldichlorophosphanes

C - Chemistry, Metallurgy

07

F

260/537.6

C07F 9/48 (2006.01) C07F 9/52 (2006.01)

Patent

CA 1199934

PROCESS FOR MAKING ARYLDICHLOROPHOSPHANES ABSTRACT OF THE DISCLOSURE: The disclosure relates to a process for making aryl- dichlorophosphanes of the general formula Image in which R1, R2 and R3 being identical or different each stand for a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, a halogen atom, an aryl group or an aryloxy group by reacting an arene of the general formula Image in which R1, R2 und R3 have the meanings given above, with at least 4 mols phosphorus(III)chloride per mol arene in the presence of aluminum chloride, boiling the mixture over a period of several hours and subsequently precipitat- ing the aluminum chloride by adding a complexing agent, filtering and distillatively working up the filtrate. More particularly, the disclosure provides for 0.05 to 0.9 mol aluminum chloride to be used per mol arene and for 1 - 3 mols finely ground alkali metal chloride to be used as the complexing agent per mol aluminum chloride.

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