60504-00-9Relevant academic research and scientific papers
Rhodium-Catalyzed Enantioselective Radical Addition of CX4 Reagents to Olefins
Chen, Bo,Fang, Cheng,Liu, Peng,Ready, Joseph M.
, p. 8780 - 8784 (2017/07/17)
We describe the synthetically useful enantioselective addition of Br?CX3 (X=Cl or Br) to terminal olefins to introduce a trihalomethyl group and generate optically active secondary bromides. Computational and experimental evidence supports an asymmetric atom-transfer radical addition (ATRA) mechanism in which the stereodetermining step involves outer-sphere bromine abstraction from a [(bisphosphine)RhIIBrCl] complex by a benzylic radical intermediate. This mechanism appears unprecedented in asymmetric catalysis.
In search of the spin-delocalization effect from the correlation analysis of relative rates of the trichloromethyl-bromo-addition reactions to fourteen p-Y-substituted phenylacetylenes
Jiang, Xi-Kui,Ji, Guo-Zhen,Xie, John Rong-Yuan
, p. 3017 - 3028 (2007/10/03)
A rigorous procedure was applied to the measurement of the relative rates, i.e. k(r)(Y) = k(Y)/k(H) of trichloromethyl-bromo-addition reactions to fourteen p-Y-substituted phenylacetylenes (I-Y, with Y = F, Cl, Br, Me, t-Bu, OMe, SMe, SiMe3, CF3, CN, NO2, SOMe, COMe, and CO2Me). The reaction was run in cyclohexane under nitrogen antmosphere at 65 ± 0.5°C. All products were derived from the intermediate YC6H4C = CHCCl3 adduct radicals. Correlation analysis of these rate data seems to suggest that both a polar and a spin-delocalization effect are operating at the transition state.
