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
Halocarbocyclization versus dihalogenation: substituent directed iodine(<scp>iii</scp>) catalyzed halogenations
作者:Maciej Stodulski、Alissa Goetzinger、Stefanie V. Kohlhepp、Tanja Gulder
DOI:10.1039/c3cc49850f
日期:——
The nucleophilicity of the substituents in iodobenzene pre-catalysts have a huge impact on product selectivity in iodine(III) triggered halogenations, steering the reactivity from solely carbocyclizations towards dihalogenations. Utilizing this catalyst-dependent reactivity a diastereo- and chemoselective dihalogenation method was established allowing the conversion of structurally and electronically
Kinetics and mechanism of electrophilic bromination of acetylenes
作者:James A. Pincock、Keith Yates
DOI:10.1139/v70-561
日期:1970.11.1
The rates of addition of molecular bromine in acetic acid to a number of acetylenes have been found to follow the general equationIn the absence of bromide ion and at low bromine concentrations (< 2 × 10−4 M), only the k2 process is observable. These k2 values for a series of ring-substituted phenylacetylenes are correlated well with σ+ values and give a ρ value of −5.17 which is interpreted in terms
BROMINATION OF ALKYNES WITH SODIUM PERBORATE AND SODIUM BROMIDE
作者:G. W. Kabalka、K. Yang
DOI:10.1080/00397919808004933
日期:1998.10
Abstract Bromination of alkynes using sodiumbromide in the presence of sodium perborate provides a convenient and safe method for generating vicinal dibromoalkenes.
A regio- and stereo-selective route to 1,1,3- and 1,2,3-trihalogenobutadienes by dehydrohalogenation of alkyl-substituted 1,1,2,3-tetrahalogenocyclopropanes
作者:Mark S. Baird、Balvinder S. Mahli、Lee Sheppard
DOI:10.1039/p19900001881
日期:——
reaction with dichlorocarbene generated under phase-transfer conditions, or dibromocarbene generated either by phase transfer or from the thermolysis of phenyl-(tribromomethyl)mercury. 1,1,2,3-Tetrahalogenocyclopropanes are also obtained by reaction of the corresponding vicinal bromochloro- and dibromo-alkenes with dichlorocarbene under phase-transfer conditions or of the latter alkenes with phenyl(