Abstract
Treatment of 1-chlorocyclobutyl p-tolyl sulfoxides with ethylmagnesium chloride at low temperature gave cyclobutylmagnesium carbenoids in over 90% yield. The generated magnesium carbenoids were found to be stable at -78 ˚C for at least 30 min. The synthesis of multisubstituted cyclobutanes and alkylidenecyclobutanes was realized based on the alkylation of the magnesium carbenoids with Grignard reagent and lithium α-sulfonyl carbanions, respectively.
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