Microporous heteropolyoxometalates Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\}/SiO\-2 were synthesized by a sol\|gel technique and characterized by IR, UV\|Vis, BET adsorption/desorption isotherm. The structural fr...Microporous heteropolyoxometalates Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\}/SiO\-2 were synthesized by a sol\|gel technique and characterized by IR, UV\|Vis, BET adsorption/desorption isotherm. The structural frameworks of Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\} are preserved within the silica networks. Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\}/SiO\-2 are a kind of polyoxometalate\|silica gel hybrids with uniform micropores of ca. 0.65 nm. They show a high catalytic activity for oxidation reaction of benzyl alcohol by H\-2O\-2(30%) in liquid\|solid systems and product selectivity for benzaldehyde(>96%). The highest activity is observed at \%x\%=2.5 in Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\}/SiO\-2 and little formation of benzoic acid and a more deeply oxidized product is observed.展开更多
An efficient and simple method for the synthesis of chalcones was reported.In the presence of sulfurous oxychloride,the cross-aldol condensation of acetone and benzaldehyde was catalyzed by the anhydrous ethanol with ...An efficient and simple method for the synthesis of chalcones was reported.In the presence of sulfurous oxychloride,the cross-aldol condensation of acetone and benzaldehyde was catalyzed by the anhydrous ethanol with good yields(60%-95%)under mild condition.The best reaction condition was studied.The reaction mechanism was also discussed.展开更多
Trimethoxybenzaldehyde (TMB) was hydrogenated over Pd/C in H 2-AcOH,in H 2-MeOH and in NH 2NH 2-PhMe system respectively.In Pd/C-TMB-H 2-AcOH system,TMB was reduced into 3,4,5-trimethoxytoluene (TMT) via 3,4,5-trimeth...Trimethoxybenzaldehyde (TMB) was hydrogenated over Pd/C in H 2-AcOH,in H 2-MeOH and in NH 2NH 2-PhMe system respectively.In Pd/C-TMB-H 2-AcOH system,TMB was reduced into 3,4,5-trimethoxytoluene (TMT) via 3,4,5-trimethoxybenzyl acetate and (1′-hydroxy)ethyl (3,4,5-trimethoxy)benzyl ether.In Pd/C-TMB-H 2-MeOH system,TMB was reduced into TMT via 3,4,5-trimethoxybenzyl alcohol,methyl(3,4,5-trimethoxy)benzyl ether and bis(3,4,5-trimethoxy)benzyl ether.In Pd/C-TMB-NH 2NH 2-PhMe system,TMB was reduced into TMT directly with mild manner and higher selectivity.展开更多
Based on the one carbon unit transfer reaction of tetrahydrofolate coenzymes, hydratropic aldehyde was synthesized successfully by using benzimidazolium salt as tetrahydrofolate coenzyme model at formic acid oxidation...Based on the one carbon unit transfer reaction of tetrahydrofolate coenzymes, hydratropic aldehyde was synthesized successfully by using benzimidazolium salt as tetrahydrofolate coenzyme model at formic acid oxidation level and Grignard reagent as a nucleophile to which one carbon unit was transfered. A novel method for the preparation of hydratropic aldehyde was provided. The mechanism for the addition hydrolysis reaction of benzimidazolium salt with Grignard reagent and the effects of reaction condition on the yield are discussed.展开更多
文摘Microporous heteropolyoxometalates Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\}/SiO\-2 were synthesized by a sol\|gel technique and characterized by IR, UV\|Vis, BET adsorption/desorption isotherm. The structural frameworks of Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\} are preserved within the silica networks. Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\}/SiO\-2 are a kind of polyoxometalate\|silica gel hybrids with uniform micropores of ca. 0.65 nm. They show a high catalytic activity for oxidation reaction of benzyl alcohol by H\-2O\-2(30%) in liquid\|solid systems and product selectivity for benzaldehyde(>96%). The highest activity is observed at \%x\%=2.5 in Cs\-\%x\%H\-\{5-\%x\%\}PW\-\{10\}V\-2O\-\{40\}/SiO\-2 and little formation of benzoic acid and a more deeply oxidized product is observed.
文摘An efficient and simple method for the synthesis of chalcones was reported.In the presence of sulfurous oxychloride,the cross-aldol condensation of acetone and benzaldehyde was catalyzed by the anhydrous ethanol with good yields(60%-95%)under mild condition.The best reaction condition was studied.The reaction mechanism was also discussed.
文摘Trimethoxybenzaldehyde (TMB) was hydrogenated over Pd/C in H 2-AcOH,in H 2-MeOH and in NH 2NH 2-PhMe system respectively.In Pd/C-TMB-H 2-AcOH system,TMB was reduced into 3,4,5-trimethoxytoluene (TMT) via 3,4,5-trimethoxybenzyl acetate and (1′-hydroxy)ethyl (3,4,5-trimethoxy)benzyl ether.In Pd/C-TMB-H 2-MeOH system,TMB was reduced into TMT via 3,4,5-trimethoxybenzyl alcohol,methyl(3,4,5-trimethoxy)benzyl ether and bis(3,4,5-trimethoxy)benzyl ether.In Pd/C-TMB-NH 2NH 2-PhMe system,TMB was reduced into TMT directly with mild manner and higher selectivity.
文摘Based on the one carbon unit transfer reaction of tetrahydrofolate coenzymes, hydratropic aldehyde was synthesized successfully by using benzimidazolium salt as tetrahydrofolate coenzyme model at formic acid oxidation level and Grignard reagent as a nucleophile to which one carbon unit was transfered. A novel method for the preparation of hydratropic aldehyde was provided. The mechanism for the addition hydrolysis reaction of benzimidazolium salt with Grignard reagent and the effects of reaction condition on the yield are discussed.
