含离子液体的新型冠钴 (II) 络合物:一种绿色高效催化剂,用于从苯甲醇开始一锅法合成色烯和呫吨衍生物
摘要:
在这项工作中,一个新的席夫碱连接到一个合成了离子液体和冠醚并与钴 (II) 配位,然后通过傅里叶变换红外、电感耦合等离子体、X 射线衍射和热重分析对其进行了表征。该催化剂用于合成呫吨和色烯。在这些合成中,使用醇代替醛或酮。在所有反应中,含有冠醚和离子液体的催化剂比不含它们的类似物表现出更高的活性。冠醚环和离子液体的存在增加了催化剂在水相中的溶解度,并增加了它作为路易斯酸与活性物质的接触面,增加了醇的氧化过程,从而提高了反应速度反应。
Studies on the photochemical behavior of N-salicylidenaniline in chloroform
作者:Liyan Zhao、Wujiong Xia、Baoquan Gou、Yu Lu、Chao Yang、Dazhi Li
DOI:10.1016/j.saa.2012.04.016
日期:2012.9
An N-salicylidenaniline (SA), compound 1 with 15-crown-5 moiety, was synthesized. The time-dependent NMR was used to track its photochromic process. The experimental results showed that ultraviolet irradiation would lead compound 1 to decompose into the corresponding salicylaldehyde and amine in chloroform solution, instead of experiencing a photochromic process. By the same method, the reported photochromic
Synthesis, metal ion binding, and photochromic properties of benzo- and naphthopyrans annelated by crown ether moieties
作者:Sergey V. Paramonov、Vladimir Lokshin、Artem B. Smolentsev、Evgeni M. Glebov、Valeri V. Korolev、Stepan S. Basok、Konstantin A. Lysenko、Stéphanie Delbaere、Olga A. Fedorova
DOI:10.1016/j.tet.2012.07.029
日期:2012.9
Combining a photochromic chromene with a crown ether moiety results in systems in which photochromism and ionophoric properties could significantly influence each other. In this paper, we report the synthesis of several chromenes annelated by 15(18)-crown-5(6) ethers. The approach involves the building of the photochromic fragment upon the initial crown ether via phenols. The two main routes for chromene