A heterogeneous gold(I)-catalyzed regioselective hydration of propargyl acetates toward α-acyloxy methyl ketones
作者:Yingying Du、Fang Yao、Rongli Zhang、Mingzhong Cai
DOI:10.1016/j.jorganchem.2020.121136
日期:2020.3
heterogeneous gold(I)-catalyzed regioselective hydration of propargylacetates has been developed that proceeds smoothly in 1,4-dioxane at room temperature in the presence of 1 mol% diphenylphosphine-modified MCM-41-anchored gold(I) complex [Ph2P-MCM-41-AuSbF6] as catalyst and provides an efficient and practical approach for the synthesis of a variety of α-acyloxy methyl ketones with high atom economy
Indazolin-<i>s</i>-ylidene–N-Heterocyclic Carbene Complexes of Rhodium, Palladium, and Gold: Synthesis, Characterization, and Catalytic Hydration of Alkynes
properties of these complexes were modified by the introduction of different substituents at the coordinated NHC ligands. Catalytic properties of the goldcomplex were evaluated in the hydration of alkynes to give the corresponding ketone products. This new type of gold N-heterocyclic carbenecomplex showed a high catalytic activity in the hydration of alkyne at roomtemperature.
Palladium-catalyzed Oxidation of Benzyl Ketones to Synthesis of α-Acetoxy Ketones Using Molecular Oxygen
作者:Zheng-Wang Chen、Dong-Nai Ye、Min Ye、Liang-Xian Liu
DOI:10.1246/cl.130694
日期:2013.11.5
An efficient procedure for the preparation of α-acetoxy ketone derivatives by palladium-catalyzed oxidation reactions employing molecularoxygen as the sole oxidant has been reported. A variety of ...
“Silver Effect” in Gold(I) Catalysis: An Overlooked Important Factor
作者:Dawei Wang、Rong Cai、Sripadh Sharma、James Jirak、Sravan K. Thummanapelli、Novruz G. Akhmedov、Hui Zhang、Xingbo Liu、Jeffrey L. Petersen、Xiaodong Shi
DOI:10.1021/ja303862z
日期:2012.5.30
Clear experimental evidence from X-ray photoelectron spectroscopy and P-31 NMR spectroscopy has been obtained for the first time to confirm that the combination of Ag+ cation with [L-Au](+) results in the formation of different complexes in solution. Re-evaluation of literature-reported gold-catalyzed reactions revealed a significant difference in the reactivities with and without silver. In extreme cases (more than "rare"), the conventional [L-Au](+) catalysts could not promote the reaction without the presence of silver. This investigation has therefore revealed a long-overlooked "silver effect" in gold catalysis and should lead to revision of the actual mechanism.