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An unusual steric effect in the binaphthyl-catalyzed asymmetric alkynylzinc addition to aldehydes is observed. Increasing the steric bulkiness at the para-position of the 3,3′-anisyl groups of the 1,1′-binaphthyl ligands, though apparently remote from the Lewis acid coordination sites, has greatly enhanced the enantioselectivity as well as catalytic activity. Propargyl alcohols with ees up to 92%...
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