Quaternary ammonium zinc - or tin-containing ionic liquids: water insensitive, recyclable catalysts for diels-alder reactions

摘要

Synthetically important Diels-Alder reactions occur in high yield in novel Lewis acidic ambient temperature ionic liquids composed of choline chloride-MCl_2 (1:2) (M = Zn or Sn). The liquids are not moisture-sensitive and after separation of the products they can be reused with no noticeable drop in activity.