- N-terminal strategy (N1-N4) toward high performance liquid crystal materials
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Liquid crystal materials have a variety of applications in many fields such as display techniques as well as photonics and optics. However, only few design principles have been disclosed on liquid crystal materials with different N-heterocycles as the terminal groups, which hinder the development of the heterocyclic liquid crystals. Here, a strategy of molecular design for N-heterocyclic liquid crystal materials is reported. On the basis of this strategy, a series of convenient N-heterocycles such as pyrrole, pyrazole, imidazole, 1,2,3-triazole, 1,2,4-triazole, 1,2,3,4-tetrazole were applied to synthesize the novel liquid crystals. Most of them have proved to exhibit good mesomorphic behaviors which make them excellent components in the mixture of the LCDs materials. The simple attachment of N-heterocyclic units to the liquid crystal molecules through a mild reaction condition will provide a good prospect for the design of N-heterocyclic liquid crystals.
- Hong, Fengying,Xia, Zhengce,Zhu, Dezhao,Wu, Hongxiang,Liu, Jianhui,Zeng, Zhuo
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supporting information
p. 1285 - 1292
(2017/02/15)
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- Alkylation of pyrazoles with ethylene chlorohydrin under phase transfer catalysis
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Alkylation reactions of pyrazoles with ethylene chlorohydrin under phase transfer catalysis were studied. Effect of solvent nature on alkylation process was established. 3(5)-Methylpyrazole alkylation products were isolated and identified.
- Baltayan,Rstakyan,Antanosyan,Kinoyan,Attaryan,Asratyan
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experimental part
p. 2417 - 2419
(2010/05/14)
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- ALKYLATION OF AZOLES USING beta -FUNCTIONAL ALKYL HALIDES UNDER CONDITIONS OF PHASE TRANSFER CATALYSIS.
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The objective of this study was to develop a convenient synthetic method for direct N-alkylation of pyrazole (I), 3(5)-methylpyrazole (II), 3,5-dimethylpyrazole (III), 1,2,4-triazole (IV), and tetrazole (V) using beta -functional alkyl halides under conditions of two-phase catalysis and with high product yields. This investigation was stimulated by the fact that the desired reaction products are intermediates in the synthesis of an important class of compounds, vinylazole, as well as of various pharmaceutical agents. It is found that depending on the acidity of the azole, alkylation with dichloroethane can be accompanied by beta -elimination. The effect of solvent on the course of alkylation reactions using dichloroethane has also been studied, and revealed that the reactions occur via the intermediacy of ion pairs rather than free anions.
- Asratyan,Attaryan,Pogosyan,Eliazyan,Darbinyan,Matsoyan
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p. 1202 - 1206
(2007/10/02)
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