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The σ-2-(cycloprop-2-enyl)vinylplatinum(II) complex (PEt 3 ) 2 Pt(Me)(CH CH- cyclo -C 3 HPh 2 ) ( 5 ) was prepared and characterized by NMR spectroscopy and X-ray crystallography. Treatment of 5 with Bronsted acids results in selective splitting of the Pt−methyl bond to give chloro derivative (PEt 3 ) 2 Pt(Cl)(CH CH- cyclo -C 3 HPh 2 ) ( 6 ), or the rearranged η 3 -diphenylcyclopentadienyl cation 7 +, depending on the acid employed. Formation of cation 7 + could also be accomplished by treatment of 6 with TlPF 6 . Monitoring the protonolysis reactions by NMR spectroscopy at −60 °C, however, showed no evidence for platinabenzene or platinabenzvalene intermediates.
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Jacob et al. (2002) studied this question.
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