Abstract
The generation and the reaction of β-copper(II) ketones via electrophilic ring opening of siloxycyclopropanes with copper(II) tetrafluoroborate (Cu(BF 4 ) 2 ) were studied. Treatment of siloglycyclopropane with Cu(BF 4 ) 2 resulted in desilylative dimerization to give a 1,6-diketone in good yield. The ring opening took place regioselectively across the bond between the methylene and siloxy carbons. The reaction is reasonably interpreted by assuming the electrophilic ring opening by cupric ion to form β-copper(II) ketone and trimethylsilylfluoride, followed by dimerization
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