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A stereoselective synthesis of conjugated bis(α‐hydroxyallenes) by copper‐mediated S N 2′‐substitution is described. Their silver‐ or gold‐catalyzed cycloisomerization affords highly functionalized 2‐allenyl‐substituted 2,5‐dihydrofurans and bis(2,5‐dihydrofurans) under axis‐to‐center chirality transfer.
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Poonoth et al. (2008) studied this question.
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