Stereoselective Halogenations of Alkenes and Alkynes in Ionic Liquids
摘要:
[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.
Alkyl Bromides as Mechanistic Probes of Reductive Dehalogenation: Reactions of Vicinal Dibromide Stereoisomers with Zerovalent Metals
作者:Lisa A. Totten、Urs Jans、A. Lynn Roberts
DOI:10.1021/es0010195
日期:2001.6.1
equivalents at the oxide-water interface. The results suggest that reduction of alkylhalides by metals is not likely to produce free radicals that persist long enough to undergo radical-radical coupling or hydrogen-atom abstraction from minor dissolved constituents. Apparent free-radical coupling products are more likely to result from (possibly surface-bound) organometallic intermediates.