Photo-on-Demand <i>In Situ</i> One-Pot Synthesis of Carbonate Esters from Tetrachloroethylene
作者:Ikkei Higashimura、Muge Shele、Toshiki Akamatsu、Ryota Ohmura、Fengying Liang、Takashi Okazoe、Akihiko Tsuda
DOI:10.1021/acs.joc.3c02588
日期:2024.2.2
base-promoted condensation reactions of alcohols with the photo-oxidized TCE that was prepared by irradiation with UV-C or visible light under O2 or O2/Cl2 (∼4%) bubbling, respectively. Cyclic carbonate esters could also be synthesized from a solution of TCE and the ethylene glycol derivative by irradiation of UV-C light under O2 bubbling. With respect to the reaction mechanism, the photochemical oxidation of
本研究报道了一种新型的光氧化四氯乙烯(TCE)一锅法合成碳酸酯的方法。无环和环状烷基碳酸酯可以通过醇与光氧化TCE的碱促进缩合反应合成,光氧化TCE是在O 2或O 2 /Cl 2 (∼4%)鼓泡下用UV-C或可见光照射制备的, 分别。环状碳酸酯也可以通过在O 2鼓泡下UV-C光照射由TCE和乙二醇衍生物的溶液合成。从反应机理来看,TCE的光化学氧化主要提供剧毒、腐蚀性强的三氯乙酰氯(TCAC),然后与醇原位反应生成相应的三氯乙酸酯(TCAE)。随后在添加或不添加醇的情况下TCAE的分子间或分子内碱催化缩合反应导致相应碳酸酯中CHCl 3的消除。本反应能够在温和条件下原位一锅合成各种烷基碳酸酯,而无需直接处理 TCAC。这在安全性、成本和减少环境影响方面都是有益的。