Under mild conditions the acyl group of acylzirconocene chloride 1 formed from an alkene or alkyne and [(C5H5)2ZrHCl] reacts as an “unmasked” acyl anion. The Lewis acid mediated reactions with aldehydes that yield α-ketol products in high yields demonstrate the versatility of this reagent for C–C coupling.
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Harada et al. (1998) studied this question.