Alkoxycarbonylation of olefins with carbon dioxide by a reusable heterobimetallic ruthenium–cobalt catalytic system
作者:Xuehua Zhang、Chaoren Shen、Chungu Xia、Xinxin Tian、Lin He
DOI:10.1039/c8gc02289e
日期:——
The heterobimetallic ruthenium–cobalt catalyticsystem exhibited good catalytic performance and reusability in the reductive alkoxycarbonylation of olefins with carbondioxide. Compared to the previous system only consisting of ruthenium catalyst, the binary catalyst system effectively reduced the usage of noble metal and ionic liquid additives. The respective contribution of ruthenium and cobalt catalysts
Diencarbonsäuren aus 1,3-dienen und CO2 durch C-C-verknüpfung an nickel(0)
作者:H. Hoberg、D. Schaefer、B.W. Oster
DOI:10.1016/0022-328x(84)80144-8
日期:1984.5
react with 1,3-dienes in the presence of CO2 to give nickela carboxylates. The influence of ligands and temperature on the regioselectivity of the CC bond formation is elucidated. In some cases the nickela carboxylates undergo reductive elimination under the influence of maleicanhydride, and the coupled diene/CO2 moiety rearranges to give the diene carboxylic acid. A possible reaction sequence is
(Lig)Ni 0系统在CO 2的存在下与1,3-二烯反应生成羧酸镍。阐明了配体和温度对CC键形成区域选择性的影响。在某些情况下,镍的羧酸盐在马来酸酐的影响下经历还原消除,并且偶合的二烯/ CO 2部分重排以得到二烯羧酸。讨论了可能的反应顺序。
Etude du caractere nucleophile des radicaux lors de la reaction de transfert sur la liaison O-O des peracides
作者:Jacques Fossey、Daniel Lefort
DOI:10.1016/0040-4020(80)80056-1
日期:1980.1
Peracids RC03H yield free radicals R' which react either with the peracid or with solvent giving the alcohol ROH and the hydrocarbon RH. The nucleophilic character of the free radicals was modified either by substitution of the carbon bearing the odd electron by inductive groups or by changing the free radical hybridation by the means of blocked structures such as cyclic or bicyclic free radicals.
Racemic Grignard reagents, 2-phenylpropylmagnesium chloride and 2-norbornylmagnesium chloride were kinetically resolved by asymmetriccross-coupling with vinyl bromides in the presence of chiral phosphine-nickel catalysts to give optically active coupling products (~37% ee) and carboxylic acids after carbonation with carbon dioxide.