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Full-Text Articles in Social and Behavioral Sciences
Synthesis Of 2-Azaspiro[4.4]Nonan-1-Ones Via Phosphine-Catalysed [3+2]-Cycloadditions, Sarah Yong, Morwenna C. Williams, Stephen G. Pyne, Alison T. Ung, Brian W. Skelton, Allan H. White, P. Turner
Synthesis Of 2-Azaspiro[4.4]Nonan-1-Ones Via Phosphine-Catalysed [3+2]-Cycloadditions, Sarah Yong, Morwenna C. Williams, Stephen G. Pyne, Alison T. Ung, Brian W. Skelton, Allan H. White, P. Turner
Faculty of Science - Papers (Archive)
The phosphine-catalysed [3+2]-cycloaddition of the 2-methylene γ-lactams 4 and 5 and the acrylate 6 with the ylides derived from the ethyl ester, the amide or the chiral camphor sultam derivative of 2-butynoic acid (7a-c) give directly, or indirectly after reductive cyclization, spiro-heterocyclic products. The acid 32 underwent Curtius rearrangement and then acid hydrolysis to give two novel spiro-cyclic ketones, 41 and 42.
Synthesis, Modeling, And Characterization Of Conducting Polymers, Geoffrey M. Spinks, Lianbin Zhao, Weihua Li, Yanzhe Wu, Dezhi Zhou, Gordon G. Wallace
Synthesis, Modeling, And Characterization Of Conducting Polymers, Geoffrey M. Spinks, Lianbin Zhao, Weihua Li, Yanzhe Wu, Dezhi Zhou, Gordon G. Wallace
Faculty of Science - Papers (Archive)
This paper presents synthesis and characterization of polypyrrole based conducting polymers in terms of electronic and mechanical disciplines. Using the electrochemical polymerization approach, conducting polymer samples with different dimensions (length, width, and thickness) was fabricated. For each sample, both sinusoidal and step excitations were used to study its mechanical and electrical properties. An equivalent electric circuit based on constant phase element (CPE) is proposed to model such responses. Electrochemical impedance spectroscopy (EIS) method was used to identify the relationship between the dimensions of conducting polymers and model elements parameters.
Synthesis Of Carbocyclic Hydantocidins Via Regioselective And Diastereoselective Phosphine-Catalyzed [3+2]-Cycloadditions To 5-Methylenehydantoins, Tien Quoc Pham, Stephen G. Pyne, Brian W. Skelton, Allan H. White
Synthesis Of Carbocyclic Hydantocidins Via Regioselective And Diastereoselective Phosphine-Catalyzed [3+2]-Cycloadditions To 5-Methylenehydantoins, Tien Quoc Pham, Stephen G. Pyne, Brian W. Skelton, Allan H. White
Faculty of Science - Papers (Archive)
The phosphine-catalysed [3+2]-cycloaddition of 5-methylenehydantoins 4 with the ylides 5, derived from addition of tributylphosphine to the 2-butynoic acid derivatives, 6a-d, gives spiro-heterocyclic products. The camphor sultam derivative 6b gives optically active products. Noteable was that the ylides derived from ethyl 2-butynoate and the 3-(2-butynoyl)-1,3-oxazolidin-2-one derivatives 6c and 6d gave spiro-heterocyclic products with reverse regioselectivities. The N,N-dibenzylprotected cycloadduct has been converted to carbocyclic hydantocidin and 6,7-diepi-carbocyclic hydantocidin.