Abstract
Regioselective addition of t-butyl-lithium to tricarbonyl(η6-benzyl alcohol)chromium(0) proceeds to give tricarbonyl(η6-5-methylene-6-exo-t-butylcyclohexa-1,3-diene)chromium(0), which can be isomerised to tricarbonyl(η6-o-t-butyltoluene)chromium(0). Repetition of the reaction on tricarbonyl(η6-1 -phenethanol)chromium(0) gives regio- and stereo-selectively the corresponding 5-ethylidene complex.
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