Substitution at 4-position in 1,2,3σ2-diazaphosphole by phosphorus trichloride

Abstract
2-Methyl-1,2,3σ2-diazaphospholes are obtained as hydrochlorides from methylhydrazones and an ecxess of PCl3 which, with longer reaction times, give the 4-dichlorophosphino-derivatives; 4-alkyl substituted diazaphospholes may be separated from their mixture with 4-unsubstituted compounds by the use of this reaction.
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