期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 5, 页码 5184-5191出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b06066
关键词
Ionic liquids; Carbon nanotubes; Lewis acids; Levulinic acid esters; Angelica lactone; Supported ionic liquid phase; Trifloaluminate ionic liquids
资金
- National Science Centre, Poland [UMO-2015/17/B/ST8/01422]
Levulinic acid esters (LAEs) were synthesized from alpha-angelica lactone and alcohols, in a reaction catalyzed by a new family of chloride-free Lewis acidic ionic liquids, containing trifloaluminate anions, [Al(POTf)(3+n)](n-). Changing the catalyst from poorly soluble Al(OTf)(3) (used as suspension) to fully homogeneous trifloaluminate ionic liquids resulted in shorter reaction times required for full alpha-AL conversion (60 min at 60 degrees C for 0.1 mol % catalyst loading) and unprecedented selectivities to LAEs, reaching >99%. Supporting the trifloaluminate ionic liquid on multiwalled carbon nanotubes gave an easily recyclable system, with no leaching observed over six cycles. Mechanistic considerations suggest that the propensity of Al(OTf)(3) to undergo very slow hydrolysis results in the correct balance of Bronsted and Lewis acidic sites in the system, which inhibit byproduct formation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据