The RuCl2(PPh3)3/γ-Al2O3 catalyst modified by chiral reagent(1S,2S)-(-)-1,2-diphenyl-1,2-ethylenediamine((1S,2S)-DPEN) was investigated for the asymmetric hydrogenation of acetophenone and its derivatives.At the opti...The RuCl2(PPh3)3/γ-Al2O3 catalyst modified by chiral reagent(1S,2S)-(-)-1,2-diphenyl-1,2-ethylenediamine((1S,2S)-DPEN) was investigated for the asymmetric hydrogenation of acetophenone and its derivatives.At the optimized reaction conditions,85% conversion of acetophenone and 82%e.e.of(R)–α-phenyl ethanol were achieved over RuCl2(PPh3)3/γ-Al2O3 catalyst modified by(1S,2S)-DPEN.Furthermore,the results indicated that there was a synergistic effect between(1S,2S)-DPEN and KOH,which significantly accelerated the reaction rate and enantioselectivity.展开更多
The catalytic behaviours of Ruthenium comlex RhC12(TPPTS) 3 as catalyst precursor for the selective hydrogenation of Carbon-crbon double bond in methylvinylketone were studied in biphasic system (aqueous/ cyclohexane ...The catalytic behaviours of Ruthenium comlex RhC12(TPPTS) 3 as catalyst precursor for the selective hydrogenation of Carbon-crbon double bond in methylvinylketone were studied in biphasic system (aqueous/ cyclohexane ). When the hydrogenation was carried out under the following condition: [Ru] = 2 × 10-3mol/L [TPPTS]/[Ru]=3, 2. 0MPa, H2O: 10mL, cyclohexane: 5mL, subettate: 25mmol,stiring speed: 600r/min, the conversion reached 70.13 % and the selectivity for the hydrosenation of C=C was 100%. The effect of molar raio of TPPTS to Ru on the activity was remarkable. When [TPPTS]/[Ru] increased to 15, the conversion raised to 100% and the selectivit was kept unchanged.展开更多
The catalytic performance of catalyst,which was formed in situ from RuCl3-TPPTS[TPPTS:P（m-C6H4SO3Na）3],for slelctive hydrogenation of carbon-carbon double bond in acrylonitrile to prepare propionitrile were studied ...The catalytic performance of catalyst,which was formed in situ from RuCl3-TPPTS[TPPTS:P（m-C6H4SO3Na）3],for slelctive hydrogenation of carbon-carbon double bond in acrylonitrile to prepare propionitrile were studied in biphasic system （aqueous/organic phase）.Good conversion and excellent selectivity were obtained.We studied the effect of KOH/Ru（molar ratio）,H2 pressure,P/Ru（molar ratio）,concentration of Ruthenium,temperature and reaction time on the catalytic activity and selectvity.The results show that the catalytic system have good conversion and very high slectivity for the hydrogenation of carbon-carbon double bond of acrylonitrile at the same time,the catalyst were separated readily from the product.展开更多
文摘The RuCl2(PPh3)3/γ-Al2O3 catalyst modified by chiral reagent(1S,2S)-(-)-1,2-diphenyl-1,2-ethylenediamine((1S,2S)-DPEN) was investigated for the asymmetric hydrogenation of acetophenone and its derivatives.At the optimized reaction conditions,85% conversion of acetophenone and 82%e.e.of(R)–α-phenyl ethanol were achieved over RuCl2(PPh3)3/γ-Al2O3 catalyst modified by(1S,2S)-DPEN.Furthermore,the results indicated that there was a synergistic effect between(1S,2S)-DPEN and KOH,which significantly accelerated the reaction rate and enantioselectivity.
文摘The catalytic behaviours of Ruthenium comlex RhC12(TPPTS) 3 as catalyst precursor for the selective hydrogenation of Carbon-crbon double bond in methylvinylketone were studied in biphasic system (aqueous/ cyclohexane ). When the hydrogenation was carried out under the following condition: [Ru] = 2 × 10-3mol/L [TPPTS]/[Ru]=3, 2. 0MPa, H2O: 10mL, cyclohexane: 5mL, subettate: 25mmol,stiring speed: 600r/min, the conversion reached 70.13 % and the selectivity for the hydrosenation of C=C was 100%. The effect of molar raio of TPPTS to Ru on the activity was remarkable. When [TPPTS]/[Ru] increased to 15, the conversion raised to 100% and the selectivit was kept unchanged.
文摘The catalytic performance of catalyst,which was formed in situ from RuCl3-TPPTS[TPPTS:P（m-C6H4SO3Na）3],for slelctive hydrogenation of carbon-carbon double bond in acrylonitrile to prepare propionitrile were studied in biphasic system （aqueous/organic phase）.Good conversion and excellent selectivity were obtained.We studied the effect of KOH/Ru（molar ratio）,H2 pressure,P/Ru（molar ratio）,concentration of Ruthenium,temperature and reaction time on the catalytic activity and selectvity.The results show that the catalytic system have good conversion and very high slectivity for the hydrogenation of carbon-carbon double bond of acrylonitrile at the same time,the catalyst were separated readily from the product.
