Biphasic aqueous organometallic catalysis promoted by cyclodextrins: can surface tension measurements explain the efficiency of chemically modified cyclodextrins?
Methylated and hydroxypropylated cyclodextrins (CDs) are highly efficient mass transfer promoters in biphasic aqueous organometallic processes. The surface tension measurements demonstrated that these CDs adsorb at air-water interface and allowed to determine surface excess of CD by using Gibbs adsorption equation. Interestingly, a good correlation between surface excess and catalytic activity was obtained in the case of hydroformylation and Tsuji-Trost reactions. These results point out the importance of CD adsorption at the interface in biphasic aqueous organometallic processes.
Leclercq
Loïc
L
Laboratoire de Physico-Chimie des Interfaces et Applications, FRE CNRS 2485, Fédération Chevreul FR CNRS 2638, Université d'Artois, Rue Jean Souvraz, SP 18-62307 Lens Cédex, France.
Bricout
Hervé
H
Tilloy
Sébastien
S
Monflier
Eric
E