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Condensations of aldehydes with chiral allenylboronic esters provide  -alkynic alcohols with an exceptionally high degree of enantioselectivity (eq 2). The reagents prepared using bulky tartrate esters like 2,4-dimethyl-3-pentyl as the chiral auxiliary are more enantioselective than reagents prepared from ethyl or isopropyl esters of tartaric acid.
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