HYDROALUMINATION AND BROMINATION OF 1-(PHENYL-SELENYL)-1-ALKYNES
摘要:
Hydroaluminuation and bromination of 1-(phenylselenyl)1-alkynes were studied and compared with the rate of hydroalumination and bromination of the corresponding alkynylsilanes.
Copper nano-catalyst: sustainable phenyl-selenylation of aryl iodides and vinyl bromides in water under ligand free conditions
作者:Amit Saha、Debasree Saha、Brindaban C. Ranu
DOI:10.1039/b819137a
日期:——
A simple and efficient procedure for the synthesis of aryl- and vinyl-selenides has been developed by a copper nanoparticle catalysed reaction of aryl iodide/vinyl bromide with diphenyl diselenide in the presence of zinc in water. (E)-Vinyl bromides produce (E)-vinyl selenides stereoselectively, whereas (Z)-vinyl bromides provide mixtures of (E) and (Z) isomers. The catalyst was recycled.
Glycerol as a promoting medium for cross-coupling reactions of diaryl diselenides with vinyl bromides
作者:Loren C. Gonçalves、Gabriela F. Fiss、Gelson Perin、Diego Alves、Raquel G. Jacob、Eder J. Lenardão
DOI:10.1016/j.tetlet.2010.10.107
日期:2010.12
herein the use of glycerol as a novel solvent in the cross-coupling reaction of diaryl diselenides with vinyl bromides catalyzed by CuI. This cross-coupling reaction was performed with diaryl diselenides and (Z)- or (E)-vinyl bromides bearing electron-withdrawing and electron-donating groups, affording the corresponding vinyl selenides in good to excellent yields. The mixture glycerol/catalyst can be
Palladium and platinum catalyzed hydroselenation of alkynes: SeH vs SeSe addition to CC bond
作者:Valentine P Ananikov、Denis A Malyshev、Irina P Beletskaya、Grigory G Aleksandrov、Igor L Eremenko
DOI:10.1016/s0022-328x(03)00546-1
日期:2003.8
alkynes catalyzed by Pd(PPh3)4 and Pt(PPh3)4 has shown that the palladium complex gives products of both SeH and SeSe bond addition to the triple bond of alkynes, while the platinum complex selectively catalyzes SeH bond addition. The key intermediate of PhSeH addition to the metal center, namely Pt(H)(SePh)(PPh3)2, was detected by 1H-NMR spectroscopy. The analogous palladium complex rapidly decomposes
The reaction of selenenyl halides with wittig reagents
作者:N. Petragnani、R. Rodrigues、J.V. Comasseto
DOI:10.1016/s0022-328x(00)87285-x
日期:1976.7
The transylidation reactions of PhSeBr with two equivalents of an alkylidene-triphenylphosphorane give selenophosphoranes, Ph3PCRSePh. These also can be obtained by treating the corresponding selenophosphonium salts, prepared by quarternization of triphenylphosphine with PhSeCHRBr, with n-BuLi. The selenophosphoranes react with aldehydes in situ (Wittig reaction) to give the expected vinylic selenides
A mild and efficient protocol for the stereoselective synthesis of vinyl selenides catalyzed by CuO nanoparticles as recyclable catalyst under ligand-free conditions is reported. This methodology results in the synthesis of a variety of vinyl selenides in excellent yields with retention of stereochemistry.