Reaction of the Carbodiphosphorane Ph3PCPPh3 with Platinum(II) and -(0) Compounds: Platinum Induced Activation of C−H Bonds

摘要: The complex [(cod)PtI2] (cod = 1,5-cyclooctadiene) reacts with 3 equiv of the hexaphenylcarbodiphosphorane Ph3PCPPh3 (1) in THF solution to give novel Pt(II) [(η3-C8H11)Pt(C6H4PPh2CPPh3)] (2) along salt [HC(PPh3)2]I. In addition coordination ylidic carbon atom at Pt atom, 2 contains two further Pt−C σ bonds originating from H exchange ortho position one phenyl group carbodiphosphorane ligand and former cod ligand. resulting C8H11 moiety is coordinated an η3 manner via a double bond uncoordinated bond. From 1:1 reaction mixture toluene/CH2Cl2 majority crystals consist [HC(PPh3)2]I·2CH2Cl2 (3) small amounts platinum compounds as byproducts. Pt(0) [(PPh3)2Pt(CH2CH2)] does not react 1 but decomposes elevated temperatures known dinuclear [Pt2(PPh3)2(μ-PPh2)2] (4). complexes 4 cou...