Materiais moleculares funcionais contendo n-heterociclos - capes

LSYC146630 LSYC_036_007 Techset Composition Ltd, Salisbury, U.K. 1/20/2006Synthetic Communications w , 36: 951–958, 2006Copyright # Taylor & Francis Group, LLCISSN 0039-7911 print/1532-2432 onlineDOI: 10.1080/00397910500466470New 1,4-Diaryl [1,2,3]-Triazole LiquidCrystals Using a Click ReactionGilmar Conte and Rodrigo CristianoDepartamento de Química, Universidadade Federal de Santa Catarina,Campus Trindade, Florianópolis, BrazilFernando ElyDivisão de Mostradores de Informação, Centro de Pesquisas RenatoArcher, Campinas, BrazilHugo GallardoDepartamento de Química, Universidadade Federal de Santa Catarina,Campus Trindade, Florianópolis, BrazilAbstract: New nonlinear compounds containing 1,4-diaryl-[1,2,3]-triazole wereprepared using a straightforward and efficient method for the regioselective synthesisof [1,2,3]-triazoles. The methodology consists of a Cu(I)-catalyzed 1,3-dipolar cycloadditionof aryl azides to terminal arylacetylenes (click reaction). All compoundsexhibited liquid-crystalline profile.Keywords: 1,3-Dipolar cycloaddition, liquid crystals, [1,2,3]-triazolesDuring the past decades a large number of liquid-crystalline compounds containingheterocyclic units have been synthesized. [1 – 4] This research field hasgrown even more in the recent years because of improvements in syntheticmethodologies. The interest in such compounds arises from the fact that theincorporation of heteroatoms can result in large changes in the correspondingliquid-crystalline phases and/or in the physical properties of the observedReceived in the USA October 12, 2005Address correspondence to Hugo Gallardo, Departamento de Química, UniversidadadeFederal de Santa Catarina, Campus Trindade, CEP 88040 900, Florianópolis, SC,Brazil. E-mail: hugo@qmc.ufsc.br951