Simple organic nitrogen bases,such as Et_3N,pyridine,DBU,etc.,were found to be convenient and useful reagents for deprotection of TBDMS groups on acidic hydroxyl groups.The efficiency of these bases has an apparent or...Simple organic nitrogen bases,such as Et_3N,pyridine,DBU,etc.,were found to be convenient and useful reagents for deprotection of TBDMS groups on acidic hydroxyl groups.The efficiency of these bases has an apparent order:1°amine>2°amine>3°amine and aliphatic base>aromatic base.In aqueous DMSO and at room temperature,phenolic TBDMS ethers were removed selectively in the presence of alcoholic TBDMS ethers.And catalytic base can make these reactions complete.This method is high-yielding,fast,clean,saf...展开更多
ESR and IR measurements have been carried out for a copper(Ⅱ)complex of phenolic polymeric crown ether,As a result,the triplet ESR spectrum(S=1)of 3d_z2 ground state copper(Ⅱ)ions was first observed for the powder s...ESR and IR measurements have been carried out for a copper(Ⅱ)complex of phenolic polymeric crown ether,As a result,the triplet ESR spectrum(S=1)of 3d_z2 ground state copper(Ⅱ)ions was first observed for the powder sample.It indicated that there existed intramolecular spin-spin interaction betweeen 3d_Z2 ground state copper(Ⅱ)and copper(Ⅱ)ions.In this binuclear triplet cluster,the axial ligntion of one water molecule in a sandwich position to two adjacent copper(Ⅱ) ions was also confirmed by IR spectra,All things considered,a possible structure for the complex was proposed.展开更多
Phenolic compounds present in medicinal and edible plants such as flavonoids, chalcones, coumarins, quinones, and phenolic acids. The antioxidant potential of phenolic compounds shows potent activities for cancer prev...Phenolic compounds present in medicinal and edible plants such as flavonoids, chalcones, coumarins, quinones, and phenolic acids. The antioxidant potential of phenolic compounds shows potent activities for cancer prevention and its treatment. From a green chemistry point of view, cascade (tandem) reactions are ideal techniques in organic synthesis for building complex structures. Cascade techniques are sometimes observed in coupling reactions under mild conditions with a tolerance of multifunctional groups. It will be interesting to find a cascade type reaction to synthesize polyphenolic ethers. This research project achieves a new cross-coupling method for establishing polyphenolic ethers from mixed phenols and halides in the presence of palladium catalyst in moderate to good yields.展开更多
为观察两种碘伏消毒剂溶液的消毒性能,采用载体定量杀菌实验方法进行了实验室研究。结果,以含有效碘50 mg/L的聚维酮碘消毒液作用3 m in,以含有效碘25 mg/L的聚醇醚碘消毒液作用3 m in,对载体上金黄色葡萄球菌和大肠杆菌平均杀灭率均达...为观察两种碘伏消毒剂溶液的消毒性能,采用载体定量杀菌实验方法进行了实验室研究。结果,以含有效碘50 mg/L的聚维酮碘消毒液作用3 m in,以含有效碘25 mg/L的聚醇醚碘消毒液作用3 m in,对载体上金黄色葡萄球菌和大肠杆菌平均杀灭率均达到99.98%以上。含有效碘100 mg/L的聚维酮碘消毒液作用5 m in,有效碘25mg/L聚醇醚碘消毒液作用3 m in,对载体上白色念珠菌平均杀灭率均达99.98%以上。以含有效碘4800 mg/L聚维酮碘消毒液作用120 m in,对载体上枯草杆菌黑色变种芽孢平均杀灭率为89.23%;有效碘5000 mg/L聚醇醚碘消毒液作用120 m in,对该细菌芽孢平均杀灭率为99.84%。结论,两种碘伏消毒液对细菌繁殖体和真菌均有较好的杀灭效果,聚维酮碘杀菌所需浓度比聚醇醚碘高1倍;两种碘伏消毒液对细菌芽孢杀灭作用很弱。展开更多
基金Project No.20672050 supported by the National Natural Science Foundation of China
文摘Simple organic nitrogen bases,such as Et_3N,pyridine,DBU,etc.,were found to be convenient and useful reagents for deprotection of TBDMS groups on acidic hydroxyl groups.The efficiency of these bases has an apparent order:1°amine>2°amine>3°amine and aliphatic base>aromatic base.In aqueous DMSO and at room temperature,phenolic TBDMS ethers were removed selectively in the presence of alcoholic TBDMS ethers.And catalytic base can make these reactions complete.This method is high-yielding,fast,clean,saf...
文摘ESR and IR measurements have been carried out for a copper(Ⅱ)complex of phenolic polymeric crown ether,As a result,the triplet ESR spectrum(S=1)of 3d_z2 ground state copper(Ⅱ)ions was first observed for the powder sample.It indicated that there existed intramolecular spin-spin interaction betweeen 3d_Z2 ground state copper(Ⅱ)and copper(Ⅱ)ions.In this binuclear triplet cluster,the axial ligntion of one water molecule in a sandwich position to two adjacent copper(Ⅱ) ions was also confirmed by IR spectra,All things considered,a possible structure for the complex was proposed.
文摘Phenolic compounds present in medicinal and edible plants such as flavonoids, chalcones, coumarins, quinones, and phenolic acids. The antioxidant potential of phenolic compounds shows potent activities for cancer prevention and its treatment. From a green chemistry point of view, cascade (tandem) reactions are ideal techniques in organic synthesis for building complex structures. Cascade techniques are sometimes observed in coupling reactions under mild conditions with a tolerance of multifunctional groups. It will be interesting to find a cascade type reaction to synthesize polyphenolic ethers. This research project achieves a new cross-coupling method for establishing polyphenolic ethers from mixed phenols and halides in the presence of palladium catalyst in moderate to good yields.
文摘为观察两种碘伏消毒剂溶液的消毒性能,采用载体定量杀菌实验方法进行了实验室研究。结果,以含有效碘50 mg/L的聚维酮碘消毒液作用3 m in,以含有效碘25 mg/L的聚醇醚碘消毒液作用3 m in,对载体上金黄色葡萄球菌和大肠杆菌平均杀灭率均达到99.98%以上。含有效碘100 mg/L的聚维酮碘消毒液作用5 m in,有效碘25mg/L聚醇醚碘消毒液作用3 m in,对载体上白色念珠菌平均杀灭率均达99.98%以上。以含有效碘4800 mg/L聚维酮碘消毒液作用120 m in,对载体上枯草杆菌黑色变种芽孢平均杀灭率为89.23%;有效碘5000 mg/L聚醇醚碘消毒液作用120 m in,对该细菌芽孢平均杀灭率为99.84%。结论,两种碘伏消毒液对细菌繁殖体和真菌均有较好的杀灭效果,聚维酮碘杀菌所需浓度比聚醇醚碘高1倍;两种碘伏消毒液对细菌芽孢杀灭作用很弱。
