Conversion of a disilenide into a silene: Silyl-anion-substituted silene by a sila-peterson-type reaction from an sp²-type silyl anion

(Chemical Equation Presented) From Si=Si to Si=C: Silyl-anion-substituted silene 2 was synthesized as air- and moisture-sensitive yellow crystals by the reaction of the disilenyl lithium derivative 1 with adamantanone (see scheme). The physical properties of 2 suggest a silene-type structure containing a silicon-carbon double bond, with no contribution from 1,2-disilaallyl-anion-type and disilene-type structures.