With 4 methyl 4′ nitrodibenzene ether,thiourea dioxide and sodium hydroxide as starting materials,the 4 methyl 4′ aminodibenzene ether is synthesized in aqueous ethanolic solution.The optimum conditions of the react...With 4 methyl 4′ nitrodibenzene ether,thiourea dioxide and sodium hydroxide as starting materials,the 4 methyl 4′ aminodibenzene ether is synthesized in aqueous ethanolic solution.The optimum conditions of the reaction are as follows∶4 melthyl 4′ nitrodibenzene ether∶thiourea dioxide∶sodium hydroxide is 1.0mol∶3.9mol∶7.5mol,the duration of additron of thiourea dioxide for the present scale is 1.0h,suitable temperature is 50℃,reaction time is 40min.The yield of 4 methyl 4′ aminodibenzene ether reaches 93.1%.展开更多
The nanostructured mesoporous Pd/MCM-41 catalyst was prepared by impregnation.This catalyst exhibited high activity and selectivity to piphenyl during Ullmann coupling reaction of iodobenzene.With Pd loading of 12%,th...The nanostructured mesoporous Pd/MCM-41 catalyst was prepared by impregnation.This catalyst exhibited high activity and selectivity to piphenyl during Ullmann coupling reaction of iodobenzene.With Pd loading of 12%,the biphenyl yield may reach 50%,showing its good potential to match the homogeneous catalyst in traditional Ullmann coupling reactions.Based on BET and XRD etc.characterizations,the relationship between the excellent catalytic properties of the Pd/MCM-41 and its structural characteristics was discussed briefly.展开更多
A new tribrominated-nitro-dihydroxydiphenyl ether has been designed and synthesized,and characterized by‘HNMR,MS,IR spectra and elemental analysis.The bioactivity test showed this compound possessed good antimicrobia...A new tribrominated-nitro-dihydroxydiphenyl ether has been designed and synthesized,and characterized by‘HNMR,MS,IR spectra and elemental analysis.The bioactivity test showed this compound possessed good antimicrobial activities against eight bacteria.展开更多
文摘With 4 methyl 4′ nitrodibenzene ether,thiourea dioxide and sodium hydroxide as starting materials,the 4 methyl 4′ aminodibenzene ether is synthesized in aqueous ethanolic solution.The optimum conditions of the reaction are as follows∶4 melthyl 4′ nitrodibenzene ether∶thiourea dioxide∶sodium hydroxide is 1.0mol∶3.9mol∶7.5mol,the duration of additron of thiourea dioxide for the present scale is 1.0h,suitable temperature is 50℃,reaction time is 40min.The yield of 4 methyl 4′ aminodibenzene ether reaches 93.1%.
文摘The nanostructured mesoporous Pd/MCM-41 catalyst was prepared by impregnation.This catalyst exhibited high activity and selectivity to piphenyl during Ullmann coupling reaction of iodobenzene.With Pd loading of 12%,the biphenyl yield may reach 50%,showing its good potential to match the homogeneous catalyst in traditional Ullmann coupling reactions.Based on BET and XRD etc.characterizations,the relationship between the excellent catalytic properties of the Pd/MCM-41 and its structural characteristics was discussed briefly.
文摘A new tribrominated-nitro-dihydroxydiphenyl ether has been designed and synthesized,and characterized by‘HNMR,MS,IR spectra and elemental analysis.The bioactivity test showed this compound possessed good antimicrobial activities against eight bacteria.
