Subnanometer Gold Clusters on Amino-Functionalized Silica: An Efficient Catalyst for the Synthesis of 1,3-Diynes by Oxidative Alkyne Coupling
作者： Beáta Vilhanová , Jiří Václavík , Luca Artiglia , Marco Ranocchiari , Antonio Togni
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摘要: Subnanometer (d= 0.8±0.2 nm) gold particles homogeneously dispersed on amino-functionalized silica catalyze Glaser-type alkyne coupling, providing corresponding 1, 3-diynes under mild conditions. Readily available λ3-iodane PhI (OAc) 2 is used as an oxidant and 1, 10-phenanthroline is used as an additive. Ten symmetrical 1, 3-diynes and three products of heterocoupling containing various functionalities are isolated in high yields. The catalyst can be recycled at least five times, giving consistently high isolated yields and …
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