Synthesis and 31P NMR spectra of some platinum(II) complexes of the phospha-alkene, (mesityl)P=CPh2: Crystal and molecular structure of cis-[PtCl2(PEt3)(C6H2Me3P=CPh2)]·CHCl3

Abstract Syntheses of the phospha-alkene complexes cis - and trans -[PtCl 2 (PEt 3 )(mesityl)P=CPh 2 ], and cis - [PtX 2 {(Mesityl)P=CPh 2 } 2 ](X=Cl, I, Me) complexes are reported. 31 P NMR spectra indicate that bonding of the phospha-alkene to the metal is via the phosphorus lone pair and this is confirmed by a single crystal X-ray diffraction study of cis -[PtCl 2 (PEt 3 ){(mesityl)P=CPh 2 }]CHCl 3 .