Some insertion reactions of platinum hydrido-complexes with olefins: hydrolysis of platinum–carbon σ-bonds

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Abstract
The insertion of olefins into the Pt–H bond of trans-PtH(NO3)(PEt3)2 occurs via preliminary substitution of nitrate by olefin, and the intermediate trans-[PtH(C2H4)(PEt3)2]BPh4 has been isolated. Butadiene and allene give π-allylic complexes and cyclo-octa-1,5-diene and norbornadiene give enyl-systems. Whereas PhN:CH·CH:CHPh gives [PtH(PhN:CH·CH:CHPh)(PEt3)2]BPh4 with no insertion, CH2:CHCOMe gives [Pt(CH2·CH2·-COMe)(PEt3)2]BPh4, the Pt–C σ-bond of which is readily hydrolysed to give [Pt2(OH)2(PEt3)4]2+ and ethyl methyl ketone.