Equilibria and UV-Spectral Characteristics of BrCl, BrCl2−, and Br2Cl− Species in 1,2-Dichloroethane − Stereoselectivity and Kinetics of the Electrophilic Addition of these Species to Alkenes
the products of bromochlorination of several aryl-substituted olefins with BrCl, with Br2 in the presence of an excess of Bu4N+Cl− (Br2/Cl−), and with BrCl in the presence of an excess of Bu4N+Cl− (BrCl/Cl−) were investigated in DCE at different temperatures. The kinetics and product distribution data for the reactions with Br2/Cl− or BrCl/Cl− are interpreted on the basis of a mechanism involving a product-
[GRAPHICS]Room-temperature ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium bromide, and 1-butyl-3-methylimidazolium chloride, are used as "green" recyclable alternative to chlorinated solvents for the stereoselective halogenation of alkenes and alkynes.
The Addition of Bromine Chloride to Carbon—Carbon Double Bonds<sup>1</sup>