Li‐Wen Xu, Lyi Li, C. Xia
Dec 1, 2004
Citations
1
Influential Citations
31
Citations
Journal
Helvetica Chimica Acta
Abstract
Ionic liquids such as 1-butyl-3-methyl-1H-imidazolium 4-methylbenzenesulfonate (BmimOTs) and its 1-ethyl analogue EmimOTs are novel effective and recyclable media for acid-catalyzed coupling reactions of aromatic alkynes with aldehydes affording (E)-enones (Scheme 1, Table) with simple recovery and easy workup due to the absence of volatile organic solvents. This transformation avoids the use of moisture-sensitive and heavy-metal Lewis acids.