POLYMER-SUPPORTED REAGENTS .1. KETALIZATION OF CYCLOHEXANONE WITH ETHYLENE-GLYCOL BY POLYMER-SUPPORTED DIPHENYLAMINE-TITANIUM TETRACHLORIDECOMPLEX - A KINETIC-STUDY

Insoluble microporous polystyrene-bound diphenylamine-titanium tetrach loride complex has been used as a catalyst in the ketalization of cycl ohexanone with ethylene glycol. The kinetics of the reaction was studi ed, and a suitable mechanism was proposed based on the results obtaine d. The observed reaction rates depend on many experimental parameters, viz., stirring speed, concentration of cyclohexanone and ethylene gly col, temperature, percent active site (percentage of ring substitution ), and percent crosslinking of the polymer. The rates were found to in crease on increasing the stirring speed from 0 to 500 rpm and then dec rease from 500 to 800 rpm. The rate of ketalization increases with inc reasing concentration of ethylene glycol, catalyst amount, and tempera ture, and decreases with increasing concentration of cyclohexanone and percentage crosslinking of the polymer.