Synthesise of (4-Ethynyl-Phenyl)-(4-trifluoromethyl-phenyl)-Diazene, a Novel Intermediate of Azobenzene Liquid Crystal with High Birefrigence

Xiao Ping Huo; Qi Pei Xu; Zong Cheng Miao

doi:10.4028/www.scientific.net/AMM.584-586.1705

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 584-586Synthesise of...

Synthesise of (4-Ethynyl-Phenyl)-(4-trifluoromethyl-phenyl)-Diazene, a Novel Intermediate of Azobenzene Liquid Crystal with High Birefrigence

Abstract:

In order to obtain an important azobenzene liquid crystal intermediate with phenylacetylene group, Sonogashira coupling reaction was used to preparation the compound. In this paper, the intermediate was synthesized by (4-Iodo-phenyl)-(4-trifluoromethyl-phenyl)-diazene and trimethyl silyl acetylene (TMSA) as raw materials, and then the trimethyl silyl group was removaled under the action of K₂CO₃. During the synthesis, the optimum reaction conditions were obtained, that the mol ratio of (4-Iodo-phenyl)-(4-trifluoromethyl-phenyl)-diazene and trimethyl silyl acetylene was 1:2, the reaction temperature was 80 oC. Fourier transform infrared spectroscopy (FT-IR) was used to measure the molecular structure of the target compound.

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Periodical:

Applied Mechanics and Materials (Volumes 584-586)

Pages:

1705-1708

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https://doi.org/10.4028/www.scientific.net/AMM.584-586.1705

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Online since:

July 2014

Authors:

Xiao Ping Huo, Qi Pei Xu, Zong Cheng Miao

Keywords:

Azobenzen, Birefrigence, Liquid Crystal, Sonogashira Coupling Reaction

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