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Optically active α,β-epoxyaldehydes obtained from nerol and geraniol were allowed to react with lithium tert-butylacetate. The diastereofacial preference of the aldolisation reaction was always anti (''Si'' face attack of the carbonyl). The best diastereoselectivity ever observed in these series (>99 : <1anti : syn) was obtained for the α,β-epoxyneral aldolisation.
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