Sterically crowded cyclopropanation catalysts. Syn-selectivity using rhodium(III)porphyrins
作者： H.J. Callot , F. Metz , C. Piechocki
DOI: 10.1016/0040-4020(82)87014-2
关键词: Ethyl diazoacetate 、 Cyclopropanation 、 Catalysis 、 Alkene 、 Decomposition 、 Selectivity 、 Rhodium 、 Organic chemistry 、 Chemistry 、 Steric effects
摘要: Abstract Rhodium(III)porphyrins catalyze the decomposition of ethyl diazoacetate and transfer ethoxy-carbonylcarbene to alkenes form cyclopropanes in moderate high yields. When compared with other catalysts a large syn -selectivity was observed on reaction cis -alkenes. This selectivity increased size substituents, suggested preferential direction approach alkene towards rhodium—carbene complex.
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