Silica-supported chlorometallate(iii) ionic liquids as recyclable catalysts for Diels–Alder reaction under solventless conditions. Issue 22 (21st October 2016)

• Record Type: Journal Article
• Authors: Matuszek, Karolina; Chrobok, Anna; Latos, Piotr; Markiton, Magdalena; Szymańska, Katarzyna; Jarzębski, Andrzej; Swadźba-Kwaśny, Małgorzata
• Is Part Of: Catalysis science & technology. Volume 6:Issue 22(2016)
• Page Start: 8129
• Page End: 8137
• Publication Date: 2016-10-21
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c6cy01771a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : The first catalytic application of supported chlorometallate(iii ) ionic liquids as recyclable heterogeneous catalysts for a Diels–Alder reaction under solventless conditions. Abstract : A range of Lewis acidic metal chlorides were tested as homogeneous catalysts in a model Diels–Alder reaction; AlCl3 and GaCl3 performed best in terms of conversion and endo : exo selectivity. Based on this outcome, the corresponding chlorometallate(iii ) ionic liquids were tested as homogeneous catalysts, without a decrease in performance compared to the chlorides. Finally, these ionic liquids were heterogenised by covalent tethering of the cation onto a multimodal porous silica support; such supported chlorogallate(iii ) ionic liquids are reported for the first time. Supported chlorometallate(iii ) ionic liquids were used as recyclable heterogeneous catalysts for the Diels–Alder reaction under solventless conditions. High yields (99%) and high endo -selectivities (95%) were obtained after very short reaction times (5 min) at near-ambient temperature (25 °C).