Allyltin tribromide: A versatile reagent involved in the ring-opening of epoxides
作者:GuoHong Chen、Xin Wang、XiaoQian Jin、LingYan Liu、WeiXing Chang、Jing Li
DOI:10.1007/s11426-010-3200-3
日期:2010.6
This paper presents a versatile reagent for epoxide cleavage. The allyltin tribromide could act as a novel and easily prepared allylationreagent and halide atom donor to convert epoxides to the corresponding homoallyl alcohols and halohydrins in high yields with excellent regioselectivities under mild reaction conditions, respectively. It could also act as a Lewis acid to catalyze the ring opening
A urea-containing metal-organic framework as a multifunctional heterogeneous hydrogen bond-donating catalyst
作者:Chengfeng Zhu、Haitong Tang、Keke Yang、Xiang Wu、Yunfei Luo、Jin Wang、Yougui Li
DOI:10.1016/j.catcom.2019.105837
日期:2020.2
A urea-containing metal-organicframework (MOF) was synthesized from a V-shaped dicarboxylate ligand and Cu(II) ions. As the undesirable self-aggregation of the urea moiety has been prohibited in the framework, this MOF can act as a heterogeneous hydrogen bond-donating (HBD) catalyst, which accelerates the cyanosilylation reaction of aldehydes, the Henry reaction of aldehydes, and the methanolysis
Ring opening of epoxides with alcohols using Fe(Cp)2BF4 as catalyst
作者:Geeta Devi Yadav、Surendra Singh
DOI:10.1016/j.tetlet.2014.05.017
日期:2014.7
Fe(Cp)(2)BF4 is an efficient catalyst for the alcoholysis of aromatic, aliphatic, and cyclic epoxides giving excellent yields of the corresponding beta-alkoxy alcohols under ambient conditions. The methanolysis of styrene oxide using Fe(Cp)(2)BF4 as a catalyst (5 mol %) gave excellent yield of 2-methoxy-2-phenylethanol with complete regio-selectivity. The ring opening of cyclic epoxides gave 77-97% yields of trans-beta-methoxy alcohols, in 0.5-6 h. The use of 1,2-epoxyhexane and 1,2-epoxydodecane as substrates gave both regioisomers in excellent yields. The first order rate of reaction with respect to catalyst was observed for the kinetics of ring opening of 1,2-epoxyhexane with methanol. (C) 2014 Elsevier Ltd. All rights reserved.
Cellulose sulfate: An efficient heterogeneous catalyst for the ring-opening of epoxides with alcohols and anilines
acts as a heterogeneous catalyst for the ring-opening of epoxides with alcohols or anilines and the Friedel-Crafts reaction between N-benzylindole and crotonaldehyde at room temperature. Methanolysis of cyclic epoxides, styrene oxide, terminal aliphatic epoxides, and glycidyl ethers were carried out using the catalyst (0.4–6.8 mg/mmol of epoxide) and afforded the corresponding products in 53–97% isolated