Abstract:Hydroxylamine derivatives Q 0110Asymmetric Addition of Phenylzinc Reagents to C-Alkynyl Nitrones. Enantiomeric Enhancement by a Product-Like Additive. -Chiral hydroxylamines (III) are formed by the addition of either diphenylzinc or phenyl(methyl)zinc to alkynyl nitrones in the presence of TAR as chiral auxiliary. Catalytic amounts of racemic product-like HYA enhance the enantioselectivity. In several cases, the application of PhZnMe gives higher enantioselectivities than ZnPh2. Catalytic amounts of HYA also s… Show more
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