Ten N-phenylacetyl-N’ -arylthioureas were synthesized using phase transfer cata-lyst PEG-400 under ultrasonic irradiation. Their structures were characterized by IR,1H NMR and elemental analysis. The method has advan...Ten N-phenylacetyl-N’ -arylthioureas were synthesized using phase transfer cata-lyst PEG-400 under ultrasonic irradiation. Their structures were characterized by IR,1H NMR and elemental analysis. The method has advantages of good yield, short reactiontime, easy operation and mild reaction conditions.展开更多
A single component molybdenum catalyst was synthesized and its activity in the cycloaddition reaction of CO_(2)and epoxide was tested.The results show that the molybdenum catalysts exhibit high activity and a broad su...A single component molybdenum catalyst was synthesized and its activity in the cycloaddition reaction of CO_(2)and epoxide was tested.The results show that the molybdenum catalysts exhibit high activity and a broad substrate scope under the reaction conditions of 80℃and 0.5 MPa of CO_(2),solvent-free,and and no nucleophilic cocatalysts,affording a wide range of cyclic carbonates in yields of 42%~94%.The reaction mechanism was investigated using in situ infrared(in situ IR),high-resolution mass spectrometry(HRMS)and Fourier transform infrared spectroscopy(FT-IR).展开更多
Transesterification between methanol and propylene carbonate is investigated over transition metal oxide ZnO, CdO catalysts The effects of reaction conditions, the supports and promoter on the catalytic activity are a...Transesterification between methanol and propylene carbonate is investigated over transition metal oxide ZnO, CdO catalysts The effects of reaction conditions, the supports and promoter on the catalytic activity are also discussed It is indicated that the catalytic activity is closely related to the surface basicity of the catalysts The yield of DMC can be improved with the surface area and amount of basicity increasing Meanwhile, the addition of promoter is preferential for the DMC yield enhancing It is found that NaX CdO K 2CO 3 catalyst shows the highest activity towards the transesterification with PC conversion and DMC yield being 35 3% and 29 0%, respectively The optimum reaction conditions for NaX CdO K 2CO 3 catalyst are: temperature 393?K～413?K, time 3?展开更多
A series of 1 substituted phenoxyacetyl 4 aroyl thiosemicarbazides were synthe sized by reaction of aroylisothiocyanate with (substituted)phenoxyacetic acid hydrazides under solid liquid phase transfer catalysis condi...A series of 1 substituted phenoxyacetyl 4 aroyl thiosemicarbazides were synthe sized by reaction of aroylisothiocyanate with (substituted)phenoxyacetic acid hydrazides under solid liquid phase transfer catalysis condition. The preliminary bioassay results showed that some of the compounds have good antibiotic activity and plant growth regulation activity. The compounds were characterized by elemental analysis, IR and 1H NMR.展开更多
文摘Ten N-phenylacetyl-N’ -arylthioureas were synthesized using phase transfer cata-lyst PEG-400 under ultrasonic irradiation. Their structures were characterized by IR,1H NMR and elemental analysis. The method has advantages of good yield, short reactiontime, easy operation and mild reaction conditions.
文摘A single component molybdenum catalyst was synthesized and its activity in the cycloaddition reaction of CO_(2)and epoxide was tested.The results show that the molybdenum catalysts exhibit high activity and a broad substrate scope under the reaction conditions of 80℃and 0.5 MPa of CO_(2),solvent-free,and and no nucleophilic cocatalysts,affording a wide range of cyclic carbonates in yields of 42%~94%.The reaction mechanism was investigated using in situ infrared(in situ IR),high-resolution mass spectrometry(HRMS)and Fourier transform infrared spectroscopy(FT-IR).
文摘Transesterification between methanol and propylene carbonate is investigated over transition metal oxide ZnO, CdO catalysts The effects of reaction conditions, the supports and promoter on the catalytic activity are also discussed It is indicated that the catalytic activity is closely related to the surface basicity of the catalysts The yield of DMC can be improved with the surface area and amount of basicity increasing Meanwhile, the addition of promoter is preferential for the DMC yield enhancing It is found that NaX CdO K 2CO 3 catalyst shows the highest activity towards the transesterification with PC conversion and DMC yield being 35 3% and 29 0%, respectively The optimum reaction conditions for NaX CdO K 2CO 3 catalyst are: temperature 393?K～413?K, time 3?
文摘A series of 1 substituted phenoxyacetyl 4 aroyl thiosemicarbazides were synthe sized by reaction of aroylisothiocyanate with (substituted)phenoxyacetic acid hydrazides under solid liquid phase transfer catalysis condition. The preliminary bioassay results showed that some of the compounds have good antibiotic activity and plant growth regulation activity. The compounds were characterized by elemental analysis, IR and 1H NMR.
