Rearrangement of a σ-2-(Cycloprop-2-enyl)vinyl- to an η3-Cyclopentadienylplatinum(II) Complex. Selective Protonolysis of the Platinum−Methyl Bond
摘要:
The sigma-2-(cycloprop-2-enyl)vinylplatinum(II) complex (PEt3)(2)Pt(Me)(CH=CH-cyclo-C3HPh2) (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 (PEt3)(2)Pt(Cl)(CH=CH-cyclo-C3HPh2) (6), or the rearranged eta(3)-diphenylcyclopentadienyl cation 7(+), depending on the acid employed. Formation of cation 7(+) could also be accomplished by treatment of 6 with TIPF6. Monitoring the protonolysis reactions by NMR spectroscopy at -60 degreesC, however, showed no evidence for platinabenzene or platinabenzvalene intermediates.
Rearrangement of a σ-2-(Cycloprop-2-enyl)vinyl- to an η3-Cyclopentadienylplatinum(II) Complex. Selective Protonolysis of the Platinum−Methyl Bond
摘要:
The sigma-2-(cycloprop-2-enyl)vinylplatinum(II) complex (PEt3)(2)Pt(Me)(CH=CH-cyclo-C3HPh2) (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 (PEt3)(2)Pt(Cl)(CH=CH-cyclo-C3HPh2) (6), or the rearranged eta(3)-diphenylcyclopentadienyl cation 7(+), depending on the acid employed. Formation of cation 7(+) could also be accomplished by treatment of 6 with TIPF6. Monitoring the protonolysis reactions by NMR spectroscopy at -60 degreesC, however, showed no evidence for platinabenzene or platinabenzvalene intermediates.