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4 and evaporated. The crude product was purified by silica gel column chromatography.
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As shown in Table 3, the reaction of 1a with 8a proceeded efficiently irrespective of the metal chloride used. This observation may be due to higher coordinating ability (Lewis basicity) of α-enones, which allows carbonyl activation even with less Lewis acidic metal ions. For the coordinating ability of α-enones, see ref. 17a.
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