Transformation of alcohols to esters promoted by hydrogen bonds using oxygen as the oxidant under metal-free conditions.
Transformation of alcohols to esters promoted by hydrogen bonds using oxygen as the oxidant under metal-free conditions.
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在无金属条件下使用氧作为氧化剂通过氢键促进醇向酯的转化
DOI:
10.1126/sciadv.aas9319
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发表时间:
2018-10
期刊:
影响因子:
13.6
通讯作者:
Han B
中科院分区:
文献类型:
--
作者:
Liu M;Zhang Z;Liu H;Xie Z;Mei Q;Han B
Ionic liquid initiates and promotes oxidative esterification of alcohols to esters under metal-free conditions in oxygen. One-pot oxidative transformation of alcohols into esters is very attractive, but metal-based catalysts are used in the reported routes. We discovered that the basic ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM] OAc) could effectively catalyze this kind of reaction using O2 as an oxidant without any other catalysts or additives. The oxidative self-esterification of benzylic alcohols or aliphatic alcohols and cross-esterification between benzyl alcohols and aliphatic alcohols could all be achieved with high yields. Detailed study revealed that the cation with acidic proton and basic acetate anion could simultaneously form multiple hydrogen bonds with the hydroxyl groups of the alcohols, which catalyzed the reaction very effectively. As far as we know, this is the first work to carry out this kind of reaction under metal-free conditions.
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