Phase vanishing reactions: Use of solid reagents and substrates

CHED 313

Nicole M. Windmon, coldplay@bellsouth.net and Veljko Dragojlovic, vdragojl@fau.edu. Department of Chemistry, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431
Phase-vanishing reactions are triphasic reactions, which involve a fluorous solvent, a reagent which is more dense than the fluorous solvent, and a substrate which is less dense. In the course of the reaction the reagent diffuses through the fluorous phase and reacts with the substrate. The reactions were successfully carried out with either a solid reagent or a solid substrate without use of any additional solvent. The methodology has been successfully applied to halogenation of alkenes. The overall reaction amounts to a gas-solid reaction. In some cases stereochemical outcome is different from halogenation in a solution.