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The stereochemistry of cyclopropanation reactions between allylsilanes and allylstannanes 6 with four representative diazoalkanes in the presence of rhodium acetate has been studied. Cyclopropanations with ethyl diazoacetate show a preference for the formation of the trans cyclopropane esters 7, whereas the corresponding reactions with (trimethylsilyl)diazomethane favor the cis stereoisomers. In both...
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