Homogeneous catalysis. A transition metal based catalyst for the Mukaiyama crossed-aldol reaction and catalyst deactivation by electron transfer.
作者:William Odenkirk、John Whelan、B. Bosnich
DOI:10.1016/0040-4039(92)89017-7
日期:1992.9
The cationic complex [Ru(salen)(NO)H2O]SbF6 is intrinsically a powerful catalyst for the Mukaiyama crossed-aldol reaction at 25°C in nitromethane solutions and at very low catalyst loadings but, for some reactions, electron transferfrom the silylenolether to the ruthenium catalyst can occur which leads to catalyst deactivation.
Homogeneous catalysis. transition metal based lewis acid catalysts.
作者:T. Keith Hollis、William Odenkirk、N.P. Robinson、John Whelan、B. Bosnich
DOI:10.1016/s0040-4020(01)87259-8
日期:1993.1
Transition metal basedLewisacids provide catalysts for the Diels-Alder and Mukaiyama reactions. These catalysts must possess an electron deficient axophilic metal center and a labile coordination position. Unlike traditional Lewisacids, those derived from transition metals can function in the presence of water and have welldefined structures. It is shown how a normally electron rich ruthenium atom