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Full-Text Articles in Social and Behavioral Sciences
Phytochemical Investigations Of Stemona Curtisii And Synthetic Studies On Stemocurtisine Alkaloids, Sukanda Chaiyong, Araya Jatisatienr, Pitchaya Mungkornasawakul, Thanapat Sastraruji, Stephen G. Pyne, Alison T. Ung, Thitima Urathamakul, Wilford Lie
Phytochemical Investigations Of Stemona Curtisii And Synthetic Studies On Stemocurtisine Alkaloids, Sukanda Chaiyong, Araya Jatisatienr, Pitchaya Mungkornasawakul, Thanapat Sastraruji, Stephen G. Pyne, Alison T. Ung, Thitima Urathamakul, Wilford Lie
Faculty of Science - Papers (Archive)
The isolation of two new Stemona alkaloids, 1-hydroxyprotostemonine and stemocurtisine N-oxide, and a new benzofuran, stemofuran L, from the root extracts of Stemona curtisii is reported. The major known alkaloids from this plant extract, stemocurtisine, stemocurtisinol, and oxyprotostemonine, were also isolated along with oxystemokerrine N-oxide. The nonalkaloid components of this extract included a new benzofuran derivative, stemofuran L, the known stemofurans F, J, and K, dihydro-γ-tocopherol, and stigmasterol. Stemocurtisine and stemocurtisinol were converted to their respective N-oxides by oxidation. Stemocurtisine was converted to a tetracyclic derivative by oxidative cleavage of the γ-butyrolactone ring, while stemocurtisinol gave a novel lactam derivative …
Investigations Of Electrochemical And Spectroelectrochemical Properties (Uv-Vis, Epr) Of Thiophene Trimer Derivatives Substituted With Phenylvinyl Groups., Pawel W. Wagner, Agnieszka Stolarczyk, Mariola Bartoszek, Mieczyslaw Lapkowski, David L. Officer, Keith C. Gordon, M Jadamiec, Wieslaw W. Sulkowski
Investigations Of Electrochemical And Spectroelectrochemical Properties (Uv-Vis, Epr) Of Thiophene Trimer Derivatives Substituted With Phenylvinyl Groups., Pawel W. Wagner, Agnieszka Stolarczyk, Mariola Bartoszek, Mieczyslaw Lapkowski, David L. Officer, Keith C. Gordon, M Jadamiec, Wieslaw W. Sulkowski
Faculty of Science - Papers (Archive)
The results of investigations concerning electrochem. properties of two thiophene trimers derivs. substituted with phenylvinyl groups {3'[(E)-2-phenylethenyl]-2,2':5',2"-thiophene (monomer A) and 4,4"-didecyloxy-3'[(E)-2-phenylethenyl]-2,2':5',2"-thiophene (monomer B)} and the products of their oxidn. were discussed. Electropolymns. of A and B monomers were carried out with use of cyclic voltammetry and electrochem. measurements were coupled in-situ with spectroscopic methods (UV-Vis, EPR). It was found that A monomer oxidized to oligomers sol. in dichloromethane while monomer B showed ability to form stable conductive polymer layers showing low-energy forbidden band (1.6 eV).