Regioselective copper-catalyzed chlorination and bromination of arenes with O2 as the oxidant
作者:Lujuan Yang、Zhan Lu、Shannon S. Stahl
DOI:10.1039/b915487f
日期:——
Electron-rich aromatic C–H bonds undergo regioselective chlorination and bromination in the presence of CuX2, LiX (X = Cl, Br) and molecular oxygen. Preliminary mechanistic insights suggest that the bromination and chlorination reactions proceed by different pathways.
Mild and Efficient Vicinal Dibromination of Olefins Mediated by Aqueous Ammonium Fluoride
作者:Tony Shing、Ying-Yeung Yeung、Wing Ng
DOI:10.1055/s-0036-1588506
日期:2018.3
A mild and efficient vicinal dibromination of olefins has been developed by using saturated aqueous ammonium fluoride solution as the promoter. Inexpensive and commercially available N -bromosuccinimide (NBS) was used as the brominating reagent. The corresponding vicinal dibromoalkanes could be obtained in good to excellent yields.
Magnetic‐Nanoparticle‐Supported 2,2′‐Bis[3‐(triethoxysilyl)propyl]imidazolium‐Substituted Diethyl Ether Bis(tribromide): A Convenient Recyclable Reagent for Bromination
作者:Liqiang Wu、Zhikui Yin
DOI:10.1002/ejic.201300755
日期:2013.12.9
A new magnetic-nanoparticle-supported bromination reagent was synthesized by anchoring a 2,2′-bis[3-(triethoxysilyl)propyl]imidazolium-substituted diethylether bis(tribromide) onto the surface of γ-Fe2O3 nanoparticles and subsequently treating this new ionic liquid with bromine. The nanoparticle reagent was obtained with good loading levels and has been successfully used for the efficient bromination
Engaging Alkenyl Halides with Alkylsilicates via Photoredox Dual Catalysis
作者:Niki R. Patel、Christopher B. Kelly、Matthieu Jouffroy、Gary A. Molander
DOI:10.1021/acs.orglett.6b00024
日期:2016.2.19
Single-electron transmetalation via photoredox/nickel dual catalysis provides the opportunity for the construction of Csp3–Csp2 bonds through the transfer of alkyl radicals under very mild reaction conditions. A general procedure for the cross-coupling of primary and secondary (bis-catecholato)alkylsilicates with alkenyl halides is presented. The developed method allows not only alkenyl bromides and
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...