Selective skeletal rearrangement by carbon–carbon bond activation

Abstract
Skeletal rearrangement of α-substituted organometallic compounds to give β-substituted compounds by carbon-carbon bond activation was performed with bis(η5-cyclopentadienyl)-2,5-dimethyl-zircons- or -hafna-cyclopentane, which were regio- and stereo-selectively converted into the corresponding 3,4-dimethylmetallacyclopentanes in high yield.