Highly efficient and recyclable catalyst for the direct chlorination, bromination and iodination of terminal alkynes
作者:Wei Shi、Zhipeng Guan、Peng Cai、Hao Chen
DOI:10.1016/j.jcat.2017.07.019
日期:2017.9
Direct halogenation, including chlorination, bromination and iodination of terminalalkynes, are of great importance in organic synthesis. Here an efficient and recyclable nano-Ag/g-C3N4 catalyst system was developed and proved to be remarkably active with 39 examples varied from chlorination, bromination to iodination, of which 14 runs have yielded more than 95% of the product. Recycling of the catalyst
直接卤化,包括末端炔烃的氯化,溴化和碘化,在有机合成中非常重要。在此,开发了一种有效且可循环利用的纳米Ag / gC 3 N 4催化剂体系,并证明其具有显着的活性,从氯化,溴化到碘化的39种实例中,有14种的收率超过了95%。在几次运行后,也实现了催化剂的再循环而没有明显的活性损失:即使在苯乙炔的溴化过程中进行了5次运行,也观察到99%的收率。该催化剂系统成本低廉且易于制备,使得该方法通用,方便且经济。
Palladium-Catalyzed Cross Haloalkynylation of Haloalkynes