3,4-Dihydropyrimidin-2-(1H)-ones were synthesized in high yields by a one-pot cyclocondensation of aldehyde,1,3-dicarbonyl compound,and urea or thiourea using copper o-toluenesulfonate as a catalyst under solvent-free...3,4-Dihydropyrimidin-2-(1H)-ones were synthesized in high yields by a one-pot cyclocondensation of aldehyde,1,3-dicarbonyl compound,and urea or thiourea using copper o-toluenesulfonate as a catalyst under solvent-free conditions at 90℃.Effects of molar ratio of reactants,amount of catalyst,and reaction temperature on the yields of 3,4-dihydropyrimidin-2-(1H)-ones were investigated.The results showed that at the condition of naldehyde∶n1,3-dicarbonyl compounds∶nurea(or thiourea)=1∶1.2∶1.5,1 mol% catalyst(molar percent of aldehyde),2.0 h at 90℃,the yields of products were 51-96%.After reaction,the catalyst could be reused for four times without distinct loss of catalytic activity.展开更多
TSA(toluene-p-sulfonic acid) doped polyaniline was prepared potentiostatically(0 5 V vs.SCE) on Pt electrode in an electrolyte solution containing 0 3 mol/L An and 0 45 mol/L TSA and investigated by cyclic voltammetry...TSA(toluene-p-sulfonic acid) doped polyaniline was prepared potentiostatically(0 5 V vs.SCE) on Pt electrode in an electrolyte solution containing 0 3 mol/L An and 0 45 mol/L TSA and investigated by cyclic voltammetry, thermal stability and solubility experimentats. The results show that the TSA doped PAn has a good redox reversibility in H 2SO 4 medium with temperature of thermal decomposition being 248 5 ℃ and soluble in NMP, DMF and DMSO.展开更多
文摘3,4-Dihydropyrimidin-2-(1H)-ones were synthesized in high yields by a one-pot cyclocondensation of aldehyde,1,3-dicarbonyl compound,and urea or thiourea using copper o-toluenesulfonate as a catalyst under solvent-free conditions at 90℃.Effects of molar ratio of reactants,amount of catalyst,and reaction temperature on the yields of 3,4-dihydropyrimidin-2-(1H)-ones were investigated.The results showed that at the condition of naldehyde∶n1,3-dicarbonyl compounds∶nurea(or thiourea)=1∶1.2∶1.5,1 mol% catalyst(molar percent of aldehyde),2.0 h at 90℃,the yields of products were 51-96%.After reaction,the catalyst could be reused for four times without distinct loss of catalytic activity.
文摘TSA(toluene-p-sulfonic acid) doped polyaniline was prepared potentiostatically(0 5 V vs.SCE) on Pt electrode in an electrolyte solution containing 0 3 mol/L An and 0 45 mol/L TSA and investigated by cyclic voltammetry, thermal stability and solubility experimentats. The results show that the TSA doped PAn has a good redox reversibility in H 2SO 4 medium with temperature of thermal decomposition being 248 5 ℃ and soluble in NMP, DMF and DMSO.
