工业界和学术界长期以来一直致力于将一氧化碳 (CO) 转化为高价值的有机分子。核心挑战之一是实现对 CO 插入具有高选择性的碳-碳偶联。我们在这里报道了一种高选择性 Au/ZnO 复合催化剂,用于 CO 与仲胺的一步氧化偶联,产生草酰胺。该反应在环境条件下具有 >99% 的选择性,在固定床反应器中,催化剂活性在约 120 小时内发生细微变化。显微镜和光谱研究的结合(包括 X 射线光电子能谱、X 射线吸收光谱、CO-傅立叶变换红外光谱、通过非化学计量的 ZnO x ( x > 1) 连接。通过密度泛函理论计算和原位漫反射红外傅里叶变换光谱信号证实了反应机理和关键反应中间体。我们的研究结果为多相催化开辟了一条途径,通过利用界面协同效应实现环境条件下的 CO 转化。
[reaction: see text] Reaction of carbamoyl chlorides with cyano-Gilman cuprates affords tertiary amides in good to excellent yields. The reaction is general due to the possibility of using reagents made either from organolithium or from Grignard compounds. The characterization of the main side products allowed for the suggestion of a possible mechanism.
A sustainable, new synthesis of oxalamides, by acceptorless dehydrogenativecoupling of ethylene glycol with amines, generating H2, homogeneously catalyzed by a rutheniumpincercomplex, is presented. The reverse hydrogenation reaction is also accomplished using the same catalyst. A plausible reaction mechanism is proposed based on stoichiometric reactions, NMR studies, X-ray crystallography as well
Novel syntheses of oxamides, oxamates and oxalates from diisopropenyl oxalate
作者:Muriel Neveux、Christian Bruneau、Serge Lécolier、Pierre H. Dixneuf
DOI:10.1016/s0040-4020(01)86342-0
日期:1993.3
Diisopropenyl oxalate, obtained by catalytic addition of oxalic acid to propyne, is a useful reagent for the access to a variety of α-dicarbonyl compounds such as oxamides, oxamates and oxalates, under very mild conditions.
[EN] PROCESS FOR THE PRODUCTION OF ETHYLENE GLYCOL AND RELATED COMPOUNDS<br/>[FR] PROCÉDÉ DE PRODUCTION DE L'ÉTHYLÈNE GLYCOL ET DE COMPOSÉS ANALOGUES
申请人:SHELL INT RESEARCH
公开号:WO2010130696A1
公开(公告)日:2010-11-18
The present invention provide a process for the production of compounds of general formula (I), Y-CH2CH2-Z (I) wherein Y and Z are functional groups independently selected from the group consisting of a hydroxyl group and R1R2N and wherein R1 and R2 may be the same or different and are functional groups selected from the group consisting of hydrogen and substituted or non- substituited alkyl groups comprising 1 to 8 carbon atoms, or R1R2N is a cyclic compound selected from the group of aromatic and non-aromatic cyclic compounds optionally comprising one or more heteroatoms in addition to the nitrogen atom, said process comprising the steps of: (i) reacting carbon monoxide and an amine in the presence of oxygen to provide a compound of general formula (II) wherein R1 and R2 or R1R2N are as defined above and X is selected from the group consisting of R1R2N and R3O, wherein R3 is selected from alkyl groups comprising 1 to 8 carbon atoms; and (ii) converting the compound of general formula (II) into a compound of general formula (I) by a process that comprises a hydrogenation reaction.
The palladium‐catalyzed oxidative carbonylation of amines toward the synthesis of oxalamides has been established around 30 years ago and it usually needs the presence of (over)stoichiometric amounts of oxidant. In this work, the first transformation of this type in which the oxidant was replaced by visible light is described. The new approach uses a simple robust Pd complex, which can even be partially