The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst,...The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst, catalyst amount and reaction time on the reaction were investigated. It is showed that the dealuminated USY is a high active catalyst for acetalization and ketaliz ation and its high activity can be readily returned to original by heating at 500 ℃ for 5 hours.展开更多
Alkyl 1,3 propanediol β bromopropanal acetals were synthesized from ethyl alkyl malonates and acrolein in three steps and were characterized by elemental analysis,IR and 1HNMR spectra.
文摘The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst, catalyst amount and reaction time on the reaction were investigated. It is showed that the dealuminated USY is a high active catalyst for acetalization and ketaliz ation and its high activity can be readily returned to original by heating at 500 ℃ for 5 hours.
文摘Alkyl 1,3 propanediol β bromopropanal acetals were synthesized from ethyl alkyl malonates and acrolein in three steps and were characterized by elemental analysis,IR and 1HNMR spectra.
