Anionic Phase-Transfer Catalysis with TFPB Ion

摘要: Tetrakis [3, 5-bis (trifluoromethyl) phenyl] borate (TFPB), a highly lipophilic fluoroaromatic ion which is remarkably stable under acid and oxidative conditions, was designed as an anionic phase-transfer catalyst, whose function to transfer cationic species such diazonium oxonium ions in reactive form of pair from aqueous (or solid) phase into nonpolar organic promote catalytically the electrophilic reactions two-phase systems. Some effecive examples catalysis (PTC) with TFPB were demonstrated diazo coupling, Friedel-Crafts alkylation, nitrosation (in situ coupling), acid-mediated hydrolysis esters, redox methylviologen liquid membrane system. Kinetic investigations these PTC clearly indicated that enhanced reactivities specificities due dehydration ion-paired phase.