Alkyl Carbonato Terminally Substituted Anils

Criswell, Thomas R.; Klanderman, B. H.; Batesky, Donald C.

doi:10.1080/15421407308083346

Cited by 29 publications

(3 citation statements)

References 10 publications

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“…The higher members (C 10 -C 16 ) were separated as solid and filtered directly without ether extraction. The boiling points and melting points of all the alkoxy anilines agree well with the values reported in the literature [24][25][26].…”

Section: -N-alkoxy Anilinessupporting

confidence: 85%

Studies of Calamitic Liquid Crystalline Compounds Involving Ester-Azo Central Linkages with a Biphenyl Moiety

Thaker

Dhimmar

Patel

et al. 2011

Molecular Crystals and Liquid Crystals

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Section: -N-alkoxy Anilinessupporting

confidence: 85%

Studies of Calamitic Liquid Crystalline Compounds Involving Ester-Azo Central Linkages with a Biphenyl Moiety

Thaker

Dhimmar

Patel

et al. 2011

Molecular Crystals and Liquid Crystals

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“…The (4-n-alkoxyphenyl)methyl triphenylphosphonium bromide and p-n-alkoxyanilines were prepared as described in the literature [9,13].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Thermotropic Liquid Crystals Derived from Phenylpiperazine Containing an Enyne Unit

Gallardo

Maurmann

2002

Molecular Crystals and Liquid Crystals

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Thermotropic liquid crystals are of great technological importance. Much research is devoted to the development of stable compounds with transition temperatures close to room temperature. The interest of this work is the synthesis of thermotropic liquid crystal precursor units containing phenylpiperazine and=or phenylacetylenic units. Homologues of a Schi base series and an enyne series have been synthesized, allowing comparisons of their mesomorphic and thermodynamic properties. The Schi bases showed smectogenic behavior and the enynes a smectic dimorphism and=or a nematic phase. The synthetic methodology was ecient for the synthesis of the desired precursor, 4-[4 H -(prop-1-yn-3-al)phenyl]-piperazine-1-carboxylic acid ethyl ester.

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“…Schiff bases, which are the most popular class of theses carbonyl derivatives, have been reported as important materials in coordination chemistry, 1,2 analytical chemistry 3,4 and liquid crystal science. [5][6][7][8][9][10][11][12] Oximes are less popular than Schiff bases, but they are found in many practical applications. 13 For example, (E)-and (Z)-oximes were used to elucidate action mechanisms of their dehydration catalyzed by liver cytochromes P450.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and thermal behavior of new liquid crystals arylaldoxime esters

Tavares¹,

Arruda²,

Böes³

et al. 2012

J. Braz. Chem. Soc.

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Uma série de cristais líquidos derivados de ésteres arilaldoximas foi sintetizada e caracterizada via espectroscopia de 1 H, 13 C RMN, ATR/IV-FT e análise elementar. A estabilidade química e fotofísica desses compostos foram dependentes dos ciclos de aquecimento e resfriamento, com a decomposição sendo induzida pelo calor. As mudanças nas propriedades durante os ciclos de aquecimento foram acompanhadas através dos respectivos espectros de infravermelho. Todas as amostras se decompõem termicamente, gerando as respectivas nitrilas e ácidos carboxílicos como evidenciado pelos espectros de infravermelho e de 1 H NMR. As propriedades mesomórficas foram avaliadas apenas no primeiro ciclo de aquecimento, devido à decomposição térmica observada após a primeira transição para o estado isotrópico. Espectros de absorção em solventes orgânicos apresentam três bandas entre 230 e 340 nm, e uma banda de emissão, larga e sem estrutura, em 430 nm. Cálculos teóricos ab initio foram realizados para a obtenção de informações estruturais dos ésteres arilaldoximas. We report the synthesis of a series of liquid-crystalline materials based on arylaldoxime esters and the characterization of these materials by 1 H, 13 C NMR, ATR/FT-IR spectroscopy and elemental analysis. The chemical stability and liquid-crystalline as well as photophysical properties of the compounds are described being dependent on the heating/cooling cycles. The changes in chemical stability and the liquid crystals properties of arylaldoxime esters were observed during these thermal cycles by IR analysis. All samples underwent a thermal degradation yielding the corresponding nitriles and carboxylic acid as evidenced by IR and 1 H NMR spectra. Due to the decomposition process, information about the mesomorphic behaviour is lost. The UV-Vis absorption spectra in solution display three absorption bands between 230 and 340 nm. The fluorescence spectra exhibit a broad and structureless emission band located at 430 nm. Ab initio calculations were performed to obtain information on the molecular structure and properties of the title compounds.

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Alkyl Carbonato Terminally Substituted Anils

Cited by 29 publications

References 10 publications

Studies of Calamitic Liquid Crystalline Compounds Involving Ester-Azo Central Linkages with a Biphenyl Moiety

Studies of Calamitic Liquid Crystalline Compounds Involving Ester-Azo Central Linkages with a Biphenyl Moiety

Synthesis of Thermotropic Liquid Crystals Derived from Phenylpiperazine Containing an Enyne Unit

Synthesis and thermal behavior of new liquid crystals arylaldoxime esters

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