Methylene blue sensitized singlet oxygen oxidation of dl-α-tocopherol in dodecylsulfate (SDS) or cetyl trimethyl ammonium brondde (CTAB) ndcelles led to the formation, besidesα-tocopherol quinone and its epoxide, of...Methylene blue sensitized singlet oxygen oxidation of dl-α-tocopherol in dodecylsulfate (SDS) or cetyl trimethyl ammonium brondde (CTAB) ndcelles led to the formation, besidesα-tocopherol quinone and its epoxide, of a hitherto unknown spiro compound 6-hydroxy-2,6,8,9-tetramethyl-2-phytyl- 1-oxaspiro [4, 5] dec -8 - en - 7, 10-dione.展开更多
Planar polycyclic aromatic hydrocarbons have important applications in optoelectronics,environmental chemistry and cancer researches.An improved sono-chemical synthetic procedure of dibenz[a,c]anthracene（D[a,c]A） wa...Planar polycyclic aromatic hydrocarbons have important applications in optoelectronics,environmental chemistry and cancer researches.An improved sono-chemical synthetic procedure of dibenz[a,c]anthracene（D[a,c]A） was reported in this work.The yield was increased to 56% and the resultant was carefully characterized via gas chromatography-electron impact mass spectrometry（GC-EIMS）,matrix assisted laser desorption ionization-time of flight（MALDI-TOF）,1 H NMR,13 C NMR,correlation spectrometry（1 H1 H COSY）,heteronuclear multiple bond correlation（HMBC） and heteronuclear multiple quantum coherence（HMQC）.Based on the characterization data,we proposed a 4-step mechanistic explanation for the formation of D[a,c]A under sono-chemical bis-ortho-Wittig reaction conditions.展开更多
The base promoted three-component reaction of β-enamino imide, malononitrile and various cyclic α-diketones in acetonitrile showed interesting molecular diversity. The reactions with acenaphthylene-1,2-dione and nin...The base promoted three-component reaction of β-enamino imide, malononitrile and various cyclic α-diketones in acetonitrile showed interesting molecular diversity. The reactions with acenaphthylene-1,2-dione and ninhydrin afforded functionalized spiro[indene-2,4＇-pyrrolo[3,4-b]pyridines] and spiro[acenaphthylene-1,4＇-pyrrolo[3,4-b]- pyridines] in good yields. The similar reaction of phenanthrene-9,10-dione resulted in the formation of the unexpected complex phenanthro[9＇, 10＇：4,5]furo[2,3-c]pyrrolo[3,4-b]pyrroles in satisfactory yields.展开更多
Ethanolic extract of dried Rumex cyprius Murb （polygonaceae） was tested against four pathogenic fungi： three dermatophytes, Microsporum canis, Trichophyton mentagrophytes and T. rubrum, and the causative agent of c...Ethanolic extract of dried Rumex cyprius Murb （polygonaceae） was tested against four pathogenic fungi： three dermatophytes, Microsporum canis, Trichophyton mentagrophytes and T. rubrum, and the causative agent of chalkbrood disease of bees, Ascophaera apis. The extract showed considerable activity against all these fungi. One of the main constituents ofRumex cyprius was isolated and tested for its antimycotic activity. It showed a significant activity against the test fungi and was identified as 1,3,8-trihydroxy-6-methylanthracene-9,10-dione based on its IR, UV-V and 1^H NMR spectra.展开更多
A new compound,9,10-dihydrophenanthrinic acid,9,10-dione-3,4-methylenedioxy-8-methoxy（1） was isolated from the roots of Peucedanum praeruptorum Dunn on the basis of spectral evidences.
文摘Methylene blue sensitized singlet oxygen oxidation of dl-α-tocopherol in dodecylsulfate (SDS) or cetyl trimethyl ammonium brondde (CTAB) ndcelles led to the formation, besidesα-tocopherol quinone and its epoxide, of a hitherto unknown spiro compound 6-hydroxy-2,6,8,9-tetramethyl-2-phytyl- 1-oxaspiro [4, 5] dec -8 - en - 7, 10-dione.
基金Supported by the Specialized Research Fund for the Doctoral Program of Higher Education from Ministry of Education of China(No.20070183202)
文摘Planar polycyclic aromatic hydrocarbons have important applications in optoelectronics,environmental chemistry and cancer researches.An improved sono-chemical synthetic procedure of dibenz[a,c]anthracene（D[a,c]A） was reported in this work.The yield was increased to 56% and the resultant was carefully characterized via gas chromatography-electron impact mass spectrometry（GC-EIMS）,matrix assisted laser desorption ionization-time of flight（MALDI-TOF）,1 H NMR,13 C NMR,correlation spectrometry（1 H1 H COSY）,heteronuclear multiple bond correlation（HMBC） and heteronuclear multiple quantum coherence（HMQC）.Based on the characterization data,we proposed a 4-step mechanistic explanation for the formation of D[a,c]A under sono-chemical bis-ortho-Wittig reaction conditions.
基金This work was financially supported by the National Natural Science Foundation of China （No. 21572196） and the Priority Academic Program Development of Jiangsu Higher Education Institutions. We also want to give sincerely thanks to the Analysis Center of Yangzhou University for providing all necessary instruments for characterization of structures.
文摘The base promoted three-component reaction of β-enamino imide, malononitrile and various cyclic α-diketones in acetonitrile showed interesting molecular diversity. The reactions with acenaphthylene-1,2-dione and ninhydrin afforded functionalized spiro[indene-2,4＇-pyrrolo[3,4-b]pyridines] and spiro[acenaphthylene-1,4＇-pyrrolo[3,4-b]- pyridines] in good yields. The similar reaction of phenanthrene-9,10-dione resulted in the formation of the unexpected complex phenanthro[9＇, 10＇：4,5]furo[2,3-c]pyrrolo[3,4-b]pyrroles in satisfactory yields.
文摘Ethanolic extract of dried Rumex cyprius Murb （polygonaceae） was tested against four pathogenic fungi： three dermatophytes, Microsporum canis, Trichophyton mentagrophytes and T. rubrum, and the causative agent of chalkbrood disease of bees, Ascophaera apis. The extract showed considerable activity against all these fungi. One of the main constituents ofRumex cyprius was isolated and tested for its antimycotic activity. It showed a significant activity against the test fungi and was identified as 1,3,8-trihydroxy-6-methylanthracene-9,10-dione based on its IR, UV-V and 1^H NMR spectra.
文摘A new compound,9,10-dihydrophenanthrinic acid,9,10-dione-3,4-methylenedioxy-8-methoxy（1） was isolated from the roots of Peucedanum praeruptorum Dunn on the basis of spectral evidences.
