Tetraalkylammonium and 1,3-Dialkylimidazolium Salts with Fluorinated Anions as Recoverable Phase-Transfer Catalysts in Solid Base-Promoted Cross-Aldol Condensations

摘要

Tetraalkylammonium and 1,3-dialkylimidazolium tetrafluo-roborates and hexafluorophosphates were employed for the first time as recoverable phase-transfer catalysts in multiphase reactions of CH-acids,in particular in solid base-promoted cross-aldol condensations.The catalysts retained their catalytic activity over several reaction cycles.