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- W1971228379 endingPage "844" @default.
- W1971228379 startingPage "837" @default.
- W1971228379 abstract "Iodo-(5,10,15,20-tetrakis(1,2,3,4,5,6,7,8-octahydro-1,4:5,8-dimethanoanthracen-9-yl)porphyrinatorhodium(III), designated as [Rh(P*)(I)], was prepared and its catalytic activity in the asymmetric cyclopropanation of alkenes with ethyl diazoacetate (EDA) was examined. High catalyst turnovers (TON >103) and moderate enantioselectivities (up to 68% ee) were observed. However, the obtained trans/cis ratios are low. Competition experiments revealed that electron-donating substituents on styrene accelerate the cyclopropanations. The log(kX/kH) versus σ+ plot for substituted styrenes exhibits a good linearity with a small negative ρ+ value (−0.14). [Rh(P*)(I)] is also active in the intramolecular cyclopropanation of allyl diazoacetates. A comparison between rhodium and ruthenium porphyrin complexes was made." @default.
- W1971228379 created "2016-06-24" @default.
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- W1971228379 date "2003-04-01" @default.
- W1971228379 modified "2023-10-18" @default.
- W1971228379 title "Asymmetric inter- and intramolecular cyclopropanations of alkenes catalyzed by rhodium D4-porphyrin: a comparison of rhodium- and ruthenium-centred catalysts" @default.
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- W1971228379 doi "https://doi.org/10.1016/s0957-4166(03)00047-8" @default.
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