一种新型瞬态 SET 介体方法已被开发用于光诱导自由基-自由基交叉偶联反应。利用原位产生的噻蒽自由基阳离子作为瞬态SET介体,在温和条件下实现了芳基噻蒽鎓盐的硫氰化和硒氰化,无需光催化剂或单一电子给体。与光触媒工艺相比,该方案具有条件温和、操作简单、底物范围广泛、优异的官能团和杂环耐受性等特点。由于芳基噻啉鎓盐的可行可及性,该方法也已应用于生物活性分子的有效合成以及复杂芳烃的后期功能化。
Iron-Catalyzed Decarboxylation of Trifluoroacetate and Its Application to the Synthesis of Trifluoromethyl Thioethers
作者:Benjamin Exner、Bilguun Bayarmagnai、Fan Jia、Lukas J. Goossen
DOI:10.1002/chem.201503915
日期:2015.11.23
Nucleophilic CF3 has been generated by decarboxylation of potassium trifluoroacetate, arguably the most easy‐to‐handle, inexpensive, and sustainable source of trifluoromethyl groups. Simple iron(II) chloride catalyzes the decarboxylation as well as a subsequent trifluoromethylation of organothiocyanates, resulting in a straightforward synthesis of trifluoromethylthioethers. The KCN byproduct is absorbed by
Nematic liquid crystal mixtures for use in bistable display devices
申请人:Dubois Jean-Claude
公开号:US20060249708A1
公开(公告)日:2006-11-09
A method of using a liquid crystal composition in a bistable liquid crystal device having a weak zenithal anchoring comprising at least 40% by weight of compounds with strong molecular polarisability and strong dipole moment.