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Branched networks of reactions create variety in this synthesis of trisubstituted allenes and functionalized enones from readily available homoallylic alcohols in just two steps, by using a new alkynylboronic ester annulation (see scheme; Mes=2,4,6-trimethylphenyl, Cy=cyclohexyl).
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Micalizio et al. (2002) studied this question.
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