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A convergent route to allylzirconocene reagents by insertion of silyl-substituted carbenoids LiCR(SiMe 3 )(Cl) into vinylzirconocene chlorides is reported. The product silylated allylzirconocenes react with aldehydes and ketones with high anti-selectivity to afford vinyl- (R=H) or allyl- (R=Me, Pr) silanes which may be converted into 4,5-trans-disubstituted -lactones and stereodefined dienes.
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