Copper(I) Iodide-Assisted Halogen Exchange at Vinylic Positions. Conversion of Vinyl, Vinylene, and Vinylidene Bromides to the Corresponding Iodo Analogs
This article describes an efficient method of bromination of organicsubstrates including aromatics, alkenes and alkynes with NH4VO3 as a catalyst and H2O2 as an oxidant agent using a non-toxic and easy-to-handle source of bromine, tetrabutylammonium bromide. The process was developed under mild reaction conditions and is an innovation from reported methods in aspects such as: i) short reaction times
本文介绍了一种有效的方法,该方法使用无毒且易于处理的溴,四丁基铵源,以NH 4 VO 3为催化剂,H 2 O 2为氧化剂,对包括芳族化合物,烯烃和炔烃在内的有机底物进行溴化。溴化物。该方法是在温和的反应条件下开发的,并且是从已报道方法的创新,例如:i)反应时间短,ii)在室温下工作的能力,iii)区域选择性和高产率。
A Domino Copper-Catalyzed C-N and C-O Cross-Coupling for the Conversion of Primary Amides into Oxazoles
作者:Frank Glorius、Kerstin Schuh (née Müller)
DOI:10.1055/s-2007-983782
日期:2007.7
A variety of oxazoles can efficiently be prepared, in a single step and in good yield, from primaryamides and 1,2-dihaloalkenes using copper-catalysis. This new method allows the re-gioselective formation of a range of substituted oxazoles. The required 1,2-dihaloalkenes can prepared by simple treatment of alkynes with elemental bromine or iodine.
The manuscript describes a novel and efficient oxidative bromination of olefins, alkynes, and ketones with HBr as the brominating reagent and DMSO as the mild oxidant. This chemistry provides an...
A divanadium-substituted phosphotungstate TBA4[γ-HPV2W10O40] (TBA = tetra-n-butylammonium) could act as an effective homogeneous catalyst for the H2O2-based oxidative bromination.
Simple and practical halogenation of arenes, alkenes and alkynes with hydrohalic acid/H2O2 (or TBHP)
作者:Nivrutti B. Barhate、Anil S. Gajare、Radhika D. Wakharkar、Ashutosh V. Bedekar
DOI:10.1016/s0040-4020(99)00628-6
日期:1999.9
hydrogen peroxide (34 %) or tert-butylhydroperoxide (70 %) and hydrohalic acid is presented. A similar procedure of oxyhalogenation involving the in situ generation of positive halogen reagents is applied for the preparation of vicinal trans-dibromoalkanes and dichloroalkanes from alkenes. The reaction of alkenes with a combination of hydrochloric acid and hydrobromic acid with hydrogen peroxide gave a