- [2+2] or [4+2]? Mechanistic studies on the gold-catalyzed intramolecular oxygen transfer of 2-alkynyl-1,5-diketones were performed using isotopic experiments and quantum chemical calculations. The results demonstrate that the transformation follows a [4+2] pathway instead of the previously proposed [2+2] path (see scheme). Various substrates were employed in the reaction and the corresponding products were obtained in excellent yields. Copyright © 2010 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.
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The [4+2], not [2+2], mechanism occurs in the gold-catalyzed intramolecular oxygen transfer reaction of 2-alkynyl-1,5-diketones.
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