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- W1965821723 abstract "A series of μ-oxo−bis[(salen)iron(III)] complexes was prepared from the reaction of the corresponding salen ligands with FeCl3·6H2O in the presence of NEt3, and characterized by elemental analysis, infrared spectroscopy, and mass spectrometry. These air-stable complexes catalyzed the cyclopropanation of olefins with ethyl diazoacetate in good yields. The catalytic activity of these μ-oxo dimers, in the cyclopropanation of styrene, was examined as a function of the diamine backbone and the substituents in the 3,3‘- and 5,5‘-positions of the phenyl rings on the ligands. Solvent variation, catalyst loading, and styrene concentration were investigated to determine the optimal reaction conditions. The complex [Fe(3,3‘,5,5‘-tBu4salen)]2O (1d) was identified as the most efficient catalyst in the series, which successfully catalyzed the cyclopropanation not only of styrene but also of less reactive substrates such as α-methylstyrene, α-(trifluoromethyl)styrene, 1,1-diphenylethylene, methylenecyclohexane, and n-butyl vinyl ether and internal olefins such as trans- and cis-β-methylstyrene and ethylidenecyclohexane." @default.
- W1965821723 created "2016-06-24" @default.
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- W1965821723 date "2003-07-25" @default.
- W1965821723 modified "2023-10-17" @default.
- W1965821723 title "Catalytic Olefin Cyclopropanation Using μ-Oxo−bis[(salen)iron(III)] Complexes" @default.
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- W1965821723 doi "https://doi.org/10.1021/om020959q" @default.
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