Aromatic nitro compounds were reduced to the corresponding anilines by refluxing with potassium selenated borohydride (KBH2Se3) prepared from potassium borohydride and selenium in refluxed formamide.
The voltammetric and polarographic behaviours of 14 rare earth elements were investigated in anhydrous acetone.The influence of residual oxygen on their waves was examined.At a concentration lower than 6× 10^(-4)...The voltammetric and polarographic behaviours of 14 rare earth elements were investigated in anhydrous acetone.The influence of residual oxygen on their waves was examined.At a concentration lower than 6× 10^(-4)mol/L,Eu^(3+),Yb^(3+)and Sm^(3+) produce two waves and other rare earth ions exhibit only one wave. When the concentration is greater than 8×10^(-4)mol/L,two waves could be observed on the reduction of Yb^(2+),Sm^(2+)and other RE^(3+)ions except for Eu^(3+).By adding 0.6% H_2O(or 1×10^(-4)mol/L NH_4ClO_4) one well-defined wave appears instead of two.The phenomenon is explained that a thin deposit film may be formed at electrode surface owing to the interaction of RE^(3+) with O_2^-,which is the reduction product of trace oxygen in aprotic solvent.In the presence of a proton donor such as H_2O or NH_4^+,oxygen reduces directly to H_2O_2 and eliminates the appearance of two waves.展开更多
Reduction of the title compounds with LiAIH_4 or DIBAL (diisobutyl aluminium hydride) leads to the formation of 2-(disubstituted hydroxymethyl)cyclopropanemethanol (2)or 4,4-disubstituted 3-oxabicyclo[3.1.0] hexan-2-o...Reduction of the title compounds with LiAIH_4 or DIBAL (diisobutyl aluminium hydride) leads to the formation of 2-(disubstituted hydroxymethyl)cyclopropanemethanol (2)or 4,4-disubstituted 3-oxabicyclo[3.1.0] hexan-2-ol (3) respectively.展开更多
In this study,an efficient catalyst Ag@g-C_(3)N_(4) nanocomposite was successfully synthesized through a simple green reaction,and the characterizations through XRD,FTIR,SEM,BET and XPS were also studied.The activitie...In this study,an efficient catalyst Ag@g-C_(3)N_(4) nanocomposite was successfully synthesized through a simple green reaction,and the characterizations through XRD,FTIR,SEM,BET and XPS were also studied.The activities of Ag@g-C_(3)N_(4) were investigated toward the reduction of 4-nitrophenol to their corresponding aminophenol compounds in the presence of excess NaBH_(4) as a reducing agent.The Ag@g-C_(3)N_(4) nanocomposites exhibited high catalytic activities,in which a 92.2%4-nitrophenol conversion in 10 min and the apparent rate constant K_(app)=264.27×10^(-3) min-1were obtained.The as-prepared Ag@g-C_(3)N_(4) nanocomposites showed great potential in catalytically inducing the reduction of 4-nitrophenol,which makes them economically and energy conservation attractive from industrial waste water treatment.展开更多
The contribution of the inhibition of angiotensin Ⅱ (ANGⅡ) synthesis and bradykinin (BK) breakdown to the effects of ACE inhibition on infarct size, cardiac hypertrophy and blood supply to the marginal zone of the i...The contribution of the inhibition of angiotensin Ⅱ (ANGⅡ) synthesis and bradykinin (BK) breakdown to the effects of ACE inhibition on infarct size, cardiac hypertrophy and blood supply to the marginal zone of the infarcted area展开更多
Recently, the National Development and Reform Commission released,from January to May, the operation of the textile industry that: is year,the domestic and international marketdem and weakened under the
The dynamic research of landslide is one of the key Points in landslidology. In the paper,from the view point of nonlinear dynamic theory. some features of Xintan landslide, such as the distribution regularities of sp...The dynamic research of landslide is one of the key Points in landslidology. In the paper,from the view point of nonlinear dynamic theory. some features of Xintan landslide, such as the distribution regularities of spatial and temporal fractal dimensions and their corresponding relationships to landslide occurring are researched. The accumulative principles of fractal dimension reduction is exploratively pointed out. The nonlinear dynamic equation of the landslide is built by analyzing the relationship between the correlation dimension and the phase space. Finally, the forecasted results and error analysis are listed. The research results are satisfactory.展开更多
文摘Aromatic nitro compounds were reduced to the corresponding anilines by refluxing with potassium selenated borohydride (KBH2Se3) prepared from potassium borohydride and selenium in refluxed formamide.
基金Project supported by National Natural Science Foundation of China
文摘The voltammetric and polarographic behaviours of 14 rare earth elements were investigated in anhydrous acetone.The influence of residual oxygen on their waves was examined.At a concentration lower than 6× 10^(-4)mol/L,Eu^(3+),Yb^(3+)and Sm^(3+) produce two waves and other rare earth ions exhibit only one wave. When the concentration is greater than 8×10^(-4)mol/L,two waves could be observed on the reduction of Yb^(2+),Sm^(2+)and other RE^(3+)ions except for Eu^(3+).By adding 0.6% H_2O(or 1×10^(-4)mol/L NH_4ClO_4) one well-defined wave appears instead of two.The phenomenon is explained that a thin deposit film may be formed at electrode surface owing to the interaction of RE^(3+) with O_2^-,which is the reduction product of trace oxygen in aprotic solvent.In the presence of a proton donor such as H_2O or NH_4^+,oxygen reduces directly to H_2O_2 and eliminates the appearance of two waves.
文摘Reduction of the title compounds with LiAIH_4 or DIBAL (diisobutyl aluminium hydride) leads to the formation of 2-(disubstituted hydroxymethyl)cyclopropanemethanol (2)or 4,4-disubstituted 3-oxabicyclo[3.1.0] hexan-2-ol (3) respectively.
基金Project supported by the Natural Science Foundation of Fujian Province(No.2019J01747 and 2020J01803)Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry(FJKLFBCM202104)China NSF(No.41976150)。
文摘In this study,an efficient catalyst Ag@g-C_(3)N_(4) nanocomposite was successfully synthesized through a simple green reaction,and the characterizations through XRD,FTIR,SEM,BET and XPS were also studied.The activities of Ag@g-C_(3)N_(4) were investigated toward the reduction of 4-nitrophenol to their corresponding aminophenol compounds in the presence of excess NaBH_(4) as a reducing agent.The Ag@g-C_(3)N_(4) nanocomposites exhibited high catalytic activities,in which a 92.2%4-nitrophenol conversion in 10 min and the apparent rate constant K_(app)=264.27×10^(-3) min-1were obtained.The as-prepared Ag@g-C_(3)N_(4) nanocomposites showed great potential in catalytically inducing the reduction of 4-nitrophenol,which makes them economically and energy conservation attractive from industrial waste water treatment.
文摘The contribution of the inhibition of angiotensin Ⅱ (ANGⅡ) synthesis and bradykinin (BK) breakdown to the effects of ACE inhibition on infarct size, cardiac hypertrophy and blood supply to the marginal zone of the infarcted area
文摘Recently, the National Development and Reform Commission released,from January to May, the operation of the textile industry that: is year,the domestic and international marketdem and weakened under the
文摘The dynamic research of landslide is one of the key Points in landslidology. In the paper,from the view point of nonlinear dynamic theory. some features of Xintan landslide, such as the distribution regularities of spatial and temporal fractal dimensions and their corresponding relationships to landslide occurring are researched. The accumulative principles of fractal dimension reduction is exploratively pointed out. The nonlinear dynamic equation of the landslide is built by analyzing the relationship between the correlation dimension and the phase space. Finally, the forecasted results and error analysis are listed. The research results are satisfactory.
