Supported Gold Nanoparticle-Catalyzed Hydration of Alkynes under Basic Conditions
摘要:
TiO2-supported nanosize gold particles catalyze the hydration of alkynes using morpholine as a basic cocatalyst. Unlike most homogeneous cationic gold catalysts, the TiO2-Au/morpholine system is weakly basic and is compatible with acid-sensitive functional groups (e.g., silyl ethers, ketals) or with a strongly coordinating group such as pyridine. Whats more, this gold catalyst can be recycled by simple filtration and works well in flow reactors.
Versatile Methodology to Hydrate Alkynes, in the Presence of a Wide Variety of Functional Groups, with Mercury(II) <i>p</i>-Toluensulfonamidate, Under Catalytic, Mild, and Neutral Conditions
作者:Albert Corominas、Ángel M. Montaña
DOI:10.1080/00397911.2012.686003
日期:2013.8.3
Abstract A method to generate carbonylic compounds from alkynes under mild and neutralconditions, with excellent functional group compatibility and good yields, is described. Hydration takes place under catalytic conditions by using 0.1 to 0.2 equivalents of the easily available and inexpensive mercury(II) p-toluensulfonamidate in a hydroalcoholic solution. After use, the catalyst is rendered inert