A mild and efficient sonochemical bromination of alkenes using tetrabutylammonium tribromide
作者:Jacques Berthelot、Yamina Benammar、Catherine Lange
DOI:10.1016/s0040-4039(00)79884-4
日期:1991.8
The bromination of substituted alkenes using tetrabutylammoniumtribromide can be effectued under mild conditions with ultrasonic irradiation. This process gives quantitatively the corresponding vicinal dibromide in high yield.
Sequential bromination reactions from beads with methyltriphenylphosphonium tribromide groups
作者:Rodrigo Cristiano、Andrew D. Walls、Richard G. Weiss
DOI:10.1002/poc.1694
日期:——
A reusable bromination reagent based on polystyrene beads with covalently appended methyltriphenylphosphoniumtribromidegroups has been developed. The results frombrominationreactions of several structurally diverse unsaturated substrates with the beads and with solutions of a non‐polymeric model brominating reagent, methyltriphenylphosphoniumtribromide, are described. It is shown that the reactions
High Quantum Yield Molecular Bromine Photoelimination from Mononuclear Platinum(IV) Complexes
作者:Alice Raphael Karikachery、Han Baek Lee、Mehdi Masjedi、Andreas Ross、Morgan A. Moody、Xiaochen Cai、Megan Chui、Carl D. Hoff、Paul R. Sharp
DOI:10.1021/ic4004998
日期:2013.4.1
Pt(IV) complexes trans-Pt(PEt3)(2)(R)(Br)(3) (R = Br, aryl and polycyclic aromatic fragments) photoeliminate molecular bromine with quantum yields as high as 82%. Photoelimination occurs both in the solid state and in solution. Calorimetry measurements and DFT calculations (PMe3 analogs) indicate endothermic and endergonic photoeliminations with free energies from 2 to 22 kcal/mol of Br-2. Solution trapping experiments with high concentrations of 2,3-dimethyl-2-butene suggest a radical-like excited state precursor to bromine elimination.
Teets, Thomas S.; Nocera, Daniel G., Journal of the American Chemical Society, 2009, vol. 131, p. 7411 - 7420
作者:Teets, Thomas S.、Nocera, Daniel G.
DOI:——
日期:——
Stereoselective Bromination Reactions Using Tridecylmethylphosphonium Tribromide in a “Stacked” Reactor
作者:Kefeng Ma、Shaw Li、Richard G. Weiss
DOI:10.1021/ol801327n
日期:2008.10.2
A new reagent, tridecylmethylphosphonium tribromide, and new procedures for bromination reactions of unsaturated substrates (including one that allows several substrates to be reacted in sequence) are described. The procedures exploit the diffusion of components and the densities and immiscibilities of layers, including a fluorous "spacer" layer, within a reaction vessel. The stereoselectivities achieved in-the reactions are superior in some cases to those found with other brominating reagents.