ChemInform Abstract: Low Coordinated Phosphorus Compounds. Part 45. Mixed Substituted Bismethylenephosphoranes by the Reaction of Carbenoides with Phosphaalkenes.

ChemInform Abstract

The known methylenephosphanes (I) react with lithio-oL-chloroorganyls (II), prepared in THF/ ether/n-pentane at - 110°C, to give the title Compounds (III) in high yields. The Compounds (IIIb)-(IIIe) represent the first mixed substituted Ä5c3-bismethylenephosphoranes that - except (IIId)-(IIIe) - can be isolated. Products (IIId)-(IIIe) rearrange to the new phosphiranes (IV). The reaction of the methylenephosphane (Ia) (R′: Ph) with diphenyldiazor?ethane leads via a spectroscopic conceivable dihydro- l ,2,4-diazaphosphole to compound (IIId). The course of the reactions, the spectroscopic data (NMR, UV, MS) as well as the X-ray structure analysis of (IIIc) (space group P2₁/n, Z=4) and (IVa) (space group Pna2" Z=4) are discussed (some yields not given).