Hydroformylation of terminal alkenes in alcohol solvents leads to the selective formation of the corresponding acetals. The Xantphos ligand gave the best results as well as acetal selectivities higher than 99% and linear/branched ratios of up to 52 were obtained. The scope of the reaction was studied. Acetals were found to be unreactive under hydroaminomethylation conditions.
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
Phosphine-ligated Ir(III)-complex as a bi-functional catalyst for one-pot tandem hydroformylation-acetalization
作者:Huan Liu、Lei Liu、Wen-Di Guo、Yong Lu、Xiao-Li Zhao、Ye Liu
DOI:10.1016/j.jcat.2019.04.004
日期:2019.5
IrIII-Lewis acid for tandem hydroformylation-acetalization of olefins. The best result was obtained over L5-based IrCl3⋅3H2O catalyticsystem which corresponded to 97% conversion of 1-hexene along with 92% selectivity to the target acetals free of any additive. The crystal structure of the novel IrIII-complex of IrIII-L4 indicated that the electron-deficient nature of the involved phosphine warranted Ir-center
The present invention relates to a method for the synthesis of an α amino acetal, comprising (i) oxidizing a tertiary amine in the presence of a copper catalyst, at least one oxidant and a solvent, or (ii) reacting a secondary amine and an aliphatic aldehyde in the presence of a copper catalyst, at least one oxidant and a solvent.