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Green chemistry: efficient acetalization of aldehydes with alcohols using the acid red 52 photocatalyst
Environmental Chemistry Letters ( IF 15.7 ) Pub Date : 2020-04-04 , DOI: 10.1007/s10311-020-00994-y
Linyu Yu , Chuyuan Lin , Chunshu Liao , Xianghua Zeng , Xiuwen Chen , Zhongzhi Zhu , Yubing Huang , Yibiao Li , Lu Chen

Green chemistry is developing to invent new reactions that are cheaper, cleaner and use less energy. Acetalization is a common strategy for the protection of aldehydes in synthetic chemistry, yet actual protocols of acetals synthesis are limited by difficult workups, the use of high-loading catalyst, harsh reaction conditions, and catalyst tedious preparation. Alternatively, photocatalysis allows to access functional products with minimum synthetic procedures and waste generation. Here we use sodium 4-[6-(diethylamino)-3-(diethyliminio)-3H-xanthen-9-yl]benzene-1,3-disulfonate (acid red 52) as photocatalyst under yellow light irradiation. We obtained a wide array of acyclic and cyclic acetals in 75–93% yields. Results show the efficient acetalization of aldehydes with alcohols at room temperature, the use of abundant and sustainable alcohols as both the solvents and coupling agents, low catalyst loading, short reaction time, and readily available catalyst, which might be applied to green-catalyzed systems.



中文翻译:

绿色化学:使用酸性红52光催化剂将醛与醇高效缩醛化

绿色化学正在发展,以发明出更便宜,更清洁且能耗更低的新反应。缩醛化是在合成化学中保护醛的常用策略,但是缩醛合成的实际方案受到困难的后处理,高负载催化剂的使用,苛刻的反应条件和催化剂繁琐的制备的限制。可选择地,光催化允许以最少的合成步骤和废物产生来获得功能性产品。在这里,我们使用4- [6-(二乙基氨基)-3-(二乙基亚氨基)-3H-黄原-9-基]苯-1,3-二磺酸钠(酸红52)作为黄光照射下的光催化剂。我们以75-93%的收率获得了各种各样的无环和环状缩醛。结果表明,室温下醛与醇的有效缩醛化反应,

更新日期:2020-04-21
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