Abstract
The use of transition metals as catalysts allows for many remarkable reactions to take place, which would be impossible in their absence. A major drawback is the high cost associated with many of these precious metals and their associated ligands. As such, achieving high turnover numbers (TONs) is a primary focus in catalysis. The authors present a highly efficient protocol for rhodium-catalyzed, enantioselective cyclopropanations. The use of donor/acceptor carbenoids under solvent-free conditions allows TONs of >1,000,000 to be obtained.
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