Abstract
Thermolysis of enynes with pentacarbonyl(butylmethoxycarbene)molybdenum (0) 1a produces vinylcyclopropanes in significantly higher yields than the analogous chromium carbene complexes 1b and 3 . Additionally, enynes with an allylic ether substituent are shown to cyclize to vinylcyclopropanes in good to excellent yield.
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