The synthesis of allantoin from carbamide and ethyl aldehydic acid with rareearth solid superacid SO2-4/TiO2La3+as catalyst was studied.It was found that the optimal experimental conditions were th...
The composite solid superacid SO2-4/TiO2-Fe2O3(nTi∶nFe=2∶1)was prepared by the method of deveiopmental sol-gel and wet impregnation.First reported the composite solid superacid catalysis sy...
By using AgNO 3 (NH 4) 2S 2O 8 as irritant agent,2,3 dimethylpyrazine was reacted with carboxylic acid to yield six novel 2,3 dimethyl 5,6 dialkylpyrazine.The structure of these compounds was idetified by elementary a...