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- W2000462952 abstract "Catalytic systems derived from [Os(TTP)]2 or Fe(TTP) (TTP = 5,10,15,20-tetra-p-tolylporphyrinato) are extremely efficient at converting styrenes and diazo reagents to cyclopropanes in high yields and high stereoselectivity. A number of mechanistic studies have been undertaken to elucidate the catalytic pathway. A mono(carbene) complex, (TTP)OsCHCO2Et, has been isolated but is not the catalytically active species. An electron-withdrawing ligand trans to the carbene in (TTP)OsCHCO2Et activates the carbon fragment toward transfer to an olefin. Labeling studies with (TTP)OsCHX and N2CHY and substrate reactivity profiles are consistent with a trans-osmium(II) bis(carbene) species as the active catalyst." @default.
- W2000462952 created "2016-06-24" @default.
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- W2000462952 date "2001-10-26" @default.
- W2000462952 modified "2023-10-16" @default.
- W2000462952 title "Mechanism of Cyclopropanation Reactions Mediated by (5,10,15,20-Tetra-<i>p</i>-tolylporphyrinato)osmium(II) Complexes" @default.
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- W2000462952 doi "https://doi.org/10.1021/om010787h" @default.
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