1997 stereochemistry

stereochemistry (general, optical resolution)O 0030

47 - 029Diastereoselective Carbonyl Addition Reactions Promoted by Yt-terbium( III) Triflate. — It is shown that in some cases the yieldand diastereoselectivity can be improved by addition of Yb(O-Tf)3, but inother cases comparable or even better results are obtained in the absence ofYb(O-Tf)3. The effect of Yb(0-Tf)3 is quite marked for alkoxy-substitutedcarbonyl compounds that favor Felkin-Anh addition. — (MOLANDER, G. A.;ESTEVEZ-BRAUN, A. M.; Bull. Soc. Chim. Fr. 134 (1997) 3-4, 275-282; Dep.Chem. Biochem., Univ. Colo., Boulder, CO 80309, USA; EN)

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