The Hydroboration-Iodination of Dialkylselenoacetylenes to Vinylic Diselenides
作者:De-Yu Yang、Xian Huang
DOI:10.1055/s-1997-959
日期:1997.8
The hydroboration of dialkylselenoacetylenes 1, generated from alkylseleno bromides and sodium acetylide in liquid ammonia, with dicycloalkylboranes followed by iodination under basic condition produced (Z)/(E)-vinylic diselenides (2/3). The reaction proceeds with a transfer of one cycloalkyl group and smoothly to give major 2 and minor 3 in almost quantitative ratio (2:3=93:7 to 97:3). The hydroboration-iodination process provides a general method for synthesis of (Z)-vinylic diselenides containing cyclic systems.
Convenient preparation of alkynyl selenides, sulfides and tellurides from terminal alkynes and prenylchalcogenyl halides in the presence of copper(I) iodide
作者:Antonio L. Braga、Claudio C. Silviera、Aurélia Reckziegel、Paulo H. Menezes
DOI:10.1016/s0040-4039(00)61445-4
日期:1993.12
Alkynyl selenides, sulfides and tellurides were obtained under very mild conditions by reacting terminal alkynes with phenylchalcogenyl halides in the presence of copper iodide(I).