Synthesis and <i>C</i>-Alkylation of Hindered Aldehyde Enamines
作者:David M. Hodgson、Christopher D. Bray、Nicholas D. Kindon、Nigel J. Reynolds、Steven J. Coote、Joann M. Um、K. N. Houk
DOI:10.1021/jo802016t
日期:2009.2.6
hindered lithium amides with terminal epoxides is described whereby aldehydeenamines are produced via a previously unrecognized reaction pathway. Some of these aldehydeenamines display unprecedented C-alkylation reactivity toward unactivated primary and secondary alkyl halides. For comparison, the reactivity of aldehydeenamines synthesized via a traditional condensation method was examined. C- rather
Rhodium-catalyzed hydroformylation of olefins: Effect of [bis(2,4-di-tert-butyl) pentaerythritol] diphosphite (alkanox P-24) on the regioselectivity of the reaction
作者:Jimoh Tijani、Bassam El Ali
DOI:10.1016/j.jorganchem.2007.04.022
日期:2007.7
pentaerythritol] diphosphite (I) as a ligand represents an active catalyst system for highly regioselective hydroformylation of various alkenes. The commercially available bis(2,4-di-tert-butyl)pentaerythritol diphosphite (alkanox P-24) (I), which has been used so far as an antioxidant in the stabilization of polymers, was used as a diphosphite ligand for the selective hydroformylation reaction of olefins
METHOD FOR HYDROFORMYLATION OF UNSATURATED COMPOUNDS
申请人:Franke Robert
公开号:US20140024860A1
公开(公告)日:2014-01-23
The invention relates to a method for hydroformylation of unsaturated compounds such as olefins and alkynes using mixtures of synthesis gas (CO/H
2
), in which either the unsaturated compounds and a catalyst are heated to a reaction temperature of 60 to 200° C. and the synthesis gas is then added, or the unsaturated compounds and the catalyst are brought into contact with pure CO at normal temperature in a preformation step, then are heated to reaction temperature and on reaching the reaction temperature the CO is replaced by the synthesis gas. The pressure is 1 to 200 bar and the CO:H
2
ratio in the synthesis gas is in the range from 1:1 to 50:1. The iridium catalyst used comprises a phosphorus-containing ligand in the iridium:ligand ratio in the range from 1:1 to 1:100. With high catalyst activities and low catalyst use, very high turnover frequencies are achieved.
Co-catalysis of a bi-functional ligand containing phosphine and Lewis acidic phosphonium for hydroformylation–acetalization of olefins
作者:Yong-Qi Li、Peng Wang、Huan Liu、Yong Lu、Xiao-Li Zhao、Ye Liu
DOI:10.1039/c5gc02127h
日期:——
L2 containing a phosphine and a Lewis acidic phosphonium exhibited synergetic catalysis and sequential catalysis for one-pot hydroformylation–acetalization.
L2 包含一种膦和一种路易斯酸性磷酸铵,展示了协同催化和顺序催化,用于一锅法羰基化-缩醛化。
Phosphonium-based aminophosphines as bifunctional ligands for sequential catalysis of one-pot hydroformylation–acetalization of olefins
作者:Peng Wang、Huan Liu、Yong-Qi Li、Xiao-Li Zhao、Yong Lu、Ye Liu
DOI:10.1039/c5cy01827g
日期:——
involved bifunctional moieties of the phosphine fragment and Lewis acidic phosphonium were linked together by stable chemical bonds and bridged by one N-atom. The molecular structure of the L2-ligated Rh-complex (Rh-L2) indicated that such bifunctionalities were well retained without incompatibility problems. Investigations on co-catalysis over L1–L3 showed that L3 exhibited the best sequential catalysis