92356-36-0Relevant articles and documents
Silica-supported chlorometallate(iii) ionic liquids as recyclable catalysts for Diels-Alder reaction under solventless conditions
Chrobok, Anna,Jarz?bski, Andrzej,Latos, Piotr,Markiton, Magdalena,Matuszek, Karolina,Swad?ba-Kwa?ny, Ma?gorzata,Szymańska, Katarzyna
, p. 8129 - 8137 (2020/10/19)
A range of Lewis acidic metal chlorides were tested as homogeneous catalysts in a model Diels-Alder reaction; AlCl3and GaCl3performed best in terms of conversion andendo : exoselectivity. 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 highendo-selectivities (95%) were obtained after very short reaction times (5 min) at near-ambient temperature (25 °C).
New Carbonyl Compounds in the High-Boiling Fraction of Lavender Oil
Kaiser, Roman,Lamparsky, Dietmar
, p. 1184 - 1197 (2007/10/02)
The occurrence of a series of new constituents which can be considered as Diels-Alder adducts of methyl vinyl ketone and ocimene (1-4), myrcene (9,10) or β-farnesene (11,12), respectively, was reported.Furthermore, the structures of four isomeric cyclohexene derivatives could be established as adducts 21-24 of (E,Z)- and (E,E)-1,3,5-undecatriene and methyl vinyl ketone.Another series of constituents having the norbornane skeleton represents adducts 25-32 and 33-40 of methylcyclopentadiene and octen-3-one or methyl vinyl ketone, respectively.In accordance with Alder's endo-rule the endo-isomers are preponderant in the natural as well as in the synthetic mixtures.Most of these constituents could also be identified in a lavender absolute as well as in a freshly prepared hexane extract of lavender flowers (Lavandula officinalis CHAIX).