Novel cyclic “ylide-carbene” complexes. I. Synthesis of 3-(Dimethylphenylphopshorane)indolidin-2-ylidene complexes of platinum(II) derived from metal-coordinated phosphonium-substituted isocyanide ligands

Nucleophilic attack of NEt3 on the activated methylene group of the -CH2 P +R3 moiety of the platinum(II)-coordinated phosphonium-substituted isocyanides o-(X-+PR3CH2)C6 H4NC (X = Cl, BF4 PR3 = PMe2Ph) produces the highly reactive ylide function - C -H P +R3, which rapidly interacts intramolecularly with the metal-coordinated isocyanide group to form novel 5-membered cyclic ylide-substituted complexes of platinum(II) of the general formula LnPtII=CN(H)C6H4C(PMe2Ph) (LnPtII = cis-PtCl2PMe2Ph); trans-PtCl(PR′3)2+, PR′3 = PPh3, PMePh2, PMe2Ph). © 1985.