α or β-hydroxy propargylic alcohols undergo tandem C(sp)–C(sp 3 ) bond cleavage via β-alkynyl elimination and homo-coupling of the resulted alkynyl species in the presence of Cu(OAc) 2 ·H 2 O to produce the corresponding hydroxycarbonyl compounds and 1,3-butadiynes.
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Xu et al. (2013) studied this question.
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