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Highly cis-selective cyclopropanations with ethyl diazoacetate using a novel Rh(I) catalyst with a chelating N-heterocyclic iminocarbene ligand.


PMID 19108673

Abstract

A structurally characterized Rh(I) iminocarbene complex (N,C)Rh(CO)Cl is activated with AgOTf to act as a highly cis-selective catalyst for the cyclopropanation of substituted styrenes and other alkenes with ethyl diazoacetate (11 examples, 10-99% yield, up to >99% cis-selectivity).

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E22201
Ethyl diazoacetate, contains ≥13 wt. % dichloromethane
C4H6N2O2