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dc.contributor.authorSchneider, Juliana Maria Forain Miolopt_BR
dc.contributor.authorSales, Eric Souzapt_BR
dc.contributor.authorLivotto, Paolo Robertopt_BR
dc.contributor.authorSchneider, Paulo Henriquept_BR
dc.contributor.authorMerlo, Aloir Antoniopt_BR
dc.date.accessioned2014-11-12T02:14:32Zpt_BR
dc.date.issued2014pt_BR
dc.identifier.issn0103-5053pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/106748pt_BR
dc.description.abstractA new family of thiazoline and thiazole esters has been synthesized and their thermal properties are presented and discussed. Thiazoline esters were obtained by cyclization reaction from 4-substituted benzenenitrile and amino acid L-cysteine followed by esterification reaction with selected alcohols and phenol. Subsequent oxidation step to transform thiazoline esters into thiazole esters was applied mediated by BrCCl3/DBU. The final thiazoline and thiazole esters are composed by terminal flexible hydrogenated alkyl chain from one side and to the other side by terminal segments of flexible alkyl chains (hydrogenated chain), (perfluoralkyl)alkyl chains (semifluorinated alkane) p-alkoxyphenyl chains. Some liquid crystals compounds for thiazoline and thiazole esters showed to be relevant. One of the thiazoline esters display a monotropic smectic A (SmA) mesophase while some thiazole esters show stable SmA mesophase. As expected semifluorinated alkane chain induce the formation of orthogonal mesophase by means of segregation effect.en
dc.description.abstractUma nova família de ésteres tiazolínicos e tiazóis foram sintetizados e as propriedades térmicas são apresentadas e discutidas. Os ésteres tiazolínicos foram obtidos pela reação de ciclização de benzonitrilas 4-substituídas com o amino ácido L-cisteína seguido da reação de esterificação com álcoois e fenol previamente selecionados. A oxidação dos ésteres tiazolínicos mediado pelo reagente BrCCl3/DBU permitiu a transformação dos respectivos ésteres tiazolínicos em ésteres tiazóis . Os compostos finais dos ésteres tiazolínicos e tiazóis são formados por cadeias alquílicas, (perfluoroalquil)alquílicas e p-alcoxifenilas. Alguns cristais líquidos mostraram serem mais relevantes. Um deles apresentou mesofase esmética A (SmA) monotrópica enquanto que outros apresentaram mesofase estável SmA. Como esperado, as cadeias de alcanos semifluorados induziram a formação de mesofase ortogonal via efeito de segregação.pt_BR
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofJournal of the Brazilian Chemical Society. São Paulo. Vol. 25, n. 8 (Aug. 2014), p. 1493-1503pt_BR
dc.rightsOpen Accessen
dc.subjectThiazoline and thiazole estersen
dc.subjectQuímica orgânicapt_BR
dc.subjectCristais líquidospt_BR
dc.subjectLiquid crystalsen
dc.subjectSemifluorinated alkaneen
dc.subjectTiazolpt_BR
dc.subjectPropriedades térmicaspt_BR
dc.subjectSmA mesophaseen
dc.titleSynthesis of new family of thiazoline and thiazole esters and investigation of their thermal propertiespt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000937835pt_BR
dc.type.originNacionalpt_BR


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