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We have previously described the ready reaction between benzophenone and phenylphosphonous dichloride or diphenylphosphinous chloride in the presence of partly hydrated aluminium chloride.1 Attempted extension of this reaction to a wider range of carbonyl compounds has met with very limited success. Thus, cyclohexanone reacts smoothly with phenylphosphonous dichloride to give, after hydrolysis of the neutral reaction products, cr-chlorocyclohexylphenylphosphinic acid (I) (42%), and o-chlorobenzaldehyde similarly affords (0-chloropheny1hydroxymethyl)phenylphosphinic acid (11) (69%) by acidification of the alkaline work-up. The latter reaction gives the same product as, and offers no advantages over, uncatalysed

Aluminium chloride catalysed reaction of phosphorus(III) halides and carbonyl compounds. II. Scope of the reaction