ChemInform Abstract: Unusually Coordinated Phosphorus Compounds. Part 24. Methylidynephosphane (HCP), a Novel Partner for 1,3‐Dipolar Cycloaddition Reactions.

Abstract

ChemInform Abstract Flash vacuum thermolysis of the phosphaalkyne (I) or pyrolytic dehydrochlorination of dichloro(methyl)phosphane (III) yields the unstable title compound (II) which is trapped by cycloaddition reaction with the diazoacetate (IVb), methyl azide (VII), benzonitrile oxide (IX), or the munchnone (XI), producing phosphorus-containing five-ring heterocycles. The chlorodisilylphosphaethene (XIII) proves to be a synthon for (II). It reacts with the diazoalkanes (IV) to give the phosphadiazoles (V) after desilylation.