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作者:Huidong Zhang , Can Li
来源:[J].Tetrahedron(IF 2.803), 2006, Vol.62 (28), pp.6640-6649
摘要:Abstract(#br)This article reports our recent work on the heterogeneous asymmetric epoxidation catalyzed by chiral Mn(salen) catalyst axially immobilized via phenoxyl groups and organic sulfonic groups. The asymmetric epoxidation of 6-cyano-2,2-dimethylchromene was especially pr...
作者:Jing Huang , Xiangkai Fu , Gang Wang ...
来源:[J].Journal of Molecular Catalysis. A, Chemical(IF 3.187), 2012, Vol.357, pp.162-173
摘要:Abstract(#br)A series of chiral salen Mn(III) catalysts immobilized onto aryldiamine modified ZnPS-PVPA with different ratio of phosphonate/phosphate for asymmetric epoxidation were synthesized and characterized by FT-IR, diffusion reflection UV–Vis, AAS, N 2 volumetric adsor...
作者:Ruth Ballesteros , Mariano Fajardo , Isabel Sierra ...
来源:[J].Journal of Molecular Catalysis. A, Chemical(IF 3.187), 2009, Vol.310 (1), pp.83-92
摘要:Abstract(#br)A molecular precursor approach involving tethering procedures was used to produce site isolated titanium-supported asymmetric epoxidation catalysts. This was done by first modifying the support in one step with a mixture of silanes: the synthesized triazine prop...
作者:Tianyi Dong , Xiaoju Wu , Jiali Cai ...
来源:[J].Inorganic Chemistry Communications(IF 2.016), 2019, Vol.101, pp.57-61
摘要:Abstract(#br)A novel type of C 2 -symmetrical diphenol-derived and axially coordinated homogeneous chiral bi-Mn(III) salen complexes are synthesized and their catalytic effects in asymmetric epoxidation of unfunctionalized olefins are investigated in details. The results show tha...
作者:Masahiro Noji , Hisako Kondo , Chihiro Yazaki ...
来源:[J].Tetrahedron Letters(IF 2.397), 2019, Vol.60 (23), pp.1518-1521
摘要:Abstract(#br)An immobilized polymer-supported vanadium-binaphthylbishydroxamic acid ( PS-VBHA ) has been developed as an efficient, reusable catalyst for the asymmetric epoxidation of allylic alcohols. This PS-VBHA catalyst shows comparable catalytic performance to that of the pa...
作者:Tony K.M Shing , Gulice Y.C Leung
来源:[J].Tetrahedron(IF 2.803), 2002, Vol.58 (37), pp.7545-7552
摘要:... The enantioselectivity of ulose 2 and 3 in asymmetric epoxidation was poor (up to 26% ee). Ulose 1 afforded good chemical yields (up to 83% yield) and the enantiomeric excess is up to 71% for the formation of (−)- trans -stilbene oxide.
作者:Dongping Wang , Mei Wang , Xiuna Wang ...
来源:[J].Journal of Molecular Catalysis. A, Chemical(IF 3.187), 2007, Vol.270 (1), pp.278-283
摘要:... The catalytic properties of 1 – 4 and 2 with excess CH 3 I were explored to figure out the influence of the internal pyridinium salt in the catalyst on asymmetric epoxidation of substituted chromenes with NaClO/PPNO as an oxidant system in the aqueous/organic biphasic ...
作者:Mei-Xin Zhao , David Goeddel , Kai Li ...
来源:[J].Tetrahedron(IF 2.803), 2006, Vol.62 (34), pp.8064-8068
摘要:Abstract(#br)N -Aryl-substituted oxazolidinone-containing ketone catalysts for the asymmetric epoxidation of olefins can be efficiently prepared from d -glucose and anilines.
作者:Lianhe Shu , Yian Shi
来源:[J].Tetrahedron Letters(IF 2.397), 2004, Vol.45 (43), pp.8115-8117
摘要:Abstract(#br)Asymmetric epoxidation of substituted cis -β-methylstyrenes using N -aryl substituted oxazolidinone-containing ketones as catalysts shows that substituents on the phenyl group of the olefin have significant positive effects on the enantioselectivity of the epoxidation...
作者:Shigeru Arai , Hiroki Tsuge , Makoto Oku ...
来源:[J].Tetrahedron(IF 2.803), 2002, Vol.58 (8), pp.1623-1630
摘要:Abstract(#br)The development of the catalytic asymmetric epoxidation of enones promoted by aqueous H 2 O 2 with chiral quaternary ammonium salts is described. The reaction smoothly proceeded to give α,β-epoxyketones with satisfactory enantioselectivities in both the trans ...

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