芳香族格氏试剂与元素碲在四氢呋喃中的一步反应,然后将中间体氧化,以80%的产率生成(RC 6 H 4)2 Te 2(R = 4-CH 3,2 -CH 3),2-Cl,4-Br,4-F,3-F,4-C 6 H 5),产率为15%至58%。其他几种芳族格氏试剂和所有测试的脂族衍生物均未反应。二乙基和二丁醚不适合用作溶剂。
Facile access to aryltellurium compounds from arylboronic acids
作者:Aaron R. Clark、Rashmi Nair、Frank R. Fronczek、Thomas Junk
DOI:10.1016/s0040-4039(02)00025-4
日期:2002.2
Arylboronic acids were treated with tellurium tetrachloride to generate substituted aryltellurium trichlorides, which were reduced to the corresponding diaryl ditellurides in good to excellent overall yields. Representative products include diphenyl ditelluride, bis(2-nitrophenyl) ditelluride, bis(3-nitrophenyl) ditelluride, bis(4-methylphenyl) ditelluride and bis(2-chlorphenyl) ditelluride. 3,5-Dimethylphenyl
A new protocol for the polyoxomolybdate-based copper-catalyzed synthesis of diselenides and ditellurides from organic iodides and elemental selenium or tellurium with moderate to excellent yields (up to 96%) is developed. The virtue of this transformation is low catalyst loading (0.5 mol%). In addition, gram-scale experiments and the reaction mechanism are studied.