ChemInform Abstract: Linear Oligophosphaalkanes. Part 19. Partial Alkylation of Phenylphosphane with Dihalomethanes CH2X2 (X: Cl, Br) - A Facile Synthesis of Methylenebis(phenylphosphane), HPhP-CH2-PPhH.

ChemInform Abstract

The reaction of NaPHPh (I) with CH₂X₂ (II) in THF affords the title compound (III) along with the compounds (IV)-(VI). (III) may be obtained in a facile one-step synthesis with yields up to 70% by reaction of PH₂Ph (VI) with CH₂Cl₂ (IIa) and KOH in DMSO/H2O or DMF/H2O as shown. The formation of (V) and (IV) may be explained by a reaction scheme including PhP=CH2 and HPhP-CH2Cl as reactive intermediates. The reactions between PhPHM (M: Na, K) and (IIa) or (IIb), resp., are studied by independent experiments.