Pj. Dyson et al., A temperature-controlled reversible ionic liquid-water two phase single phase protocol for hydrogenation catalysis, CAN J CHEM, 79(5), 2001, pp. 705-708
Citations number
43
Categorie Soggetti
Chemistry
Journal title
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
An ionic liquid - water system that undergoes a reversible two phase - sing
le phase transformation dependent upon temperature has been used as a novel
medium for the transition-metal-catalyzed hydrogenation of a water soluble
substrate. At room temperature, the ionic liquid 1-octyl-3-methylimidizoli
um tetrafluoroborate, containing [Rh(eta (4)-C7H8)(PPh3)(2)][BF4] catalyst,
forms a separate layer to water containing 2-butyne-1,4-diol. In a stirred
autoclave the mixture was pressurized with hydrogen to 60 atm (1 atm = 101
.325 kPa) and heated to 80 degreesC giving a homogeneous single phase solut
ion. On cooling to room temperature, two phases reform, with the ionic liqu
id phase containing the catalyst and the aqueous phase containing a mixture
of 2-butene-1,4-diol and butane-1,4-diol products that can be simply remov
ed without catalyst contamination.