title: Sonochemical cycloadditions in ionic liquids. Lessons from model cases involving common dienes and carbonyl dienophiles.
abstract: This contribution describes a series of sonochemical cycloadditions involving either cyclopentadiene or 1,3-cyclohexadiene with carbonyl dienophiles in an imidazolium-based ionic liquid as reaction medium. In general, ultrasound does effectively improve these processes in terms of higher yields and/or shorter reaction times when compared with the corresponding silent reactions. Stereoselectivities, however, remain practically unaffected by sonication. The role of ionic liquids under ultrasonic activation is also discussed.
authors.affiliation: Departamento de Química Orgánica, Universidad de Extremadura, Cáceres E-10071, Spain. jlbravo@unex.es
authors.forename: José Luis
authors.initials: JL
authors.lastname: Bravo
authors.forename: Ignacio
authors.initials: I
authors.lastname: López
authors.forename: Pedro
authors.initials: P
authors.lastname: Cintas
authors.forename: Guadalupe
authors.initials: G
authors.lastname: Silvero
authors.forename: María José
authors.initials: MJ
authors.lastname: Arévalo
mesh_terms: D002621:Chemistry / Q000379:methods*; D002855:Chromatography, Thin Layer; D003510:Cyclohexanes / Q000737:chemistry*; D053138:Cyclohexenes; D003517:Cyclopentanes / Q000737:chemistry*; D007477:Ions; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D012997:Solvents / Q000737:chemistry; D013010:Sonication; D013696:Temperature; D014465:Ultrasonics
chemical_list: D003510:Cyclohexanes; D053138:Cyclohexenes; D003517:Cyclopentanes; D007477:Ions; D012997:Solvents; C034005:1,3-cyclohexadiene