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In the case of both d- and l-glycero-d-galacto-configured donors, as with l-glycero-d-gluco donors, equatorial products are overwhelmingly favored. In contrast to the previous case, the d-glycero-d-gluco donor shows a modest level of preference for axial selectivity. Donor side-chain conformation and the electron-withdrawing character of the thioacetal group are essential factors for understanding the observed selectivity patterns. Raney nick