Liquid Crystal Phase Behavior of Novel Mesogenic Compound with Trifluoromethyl Substitutent

2013 ◽  
Vol 785-786 ◽  
pp. 680-683
Author(s):  
Yong Ming Zhang ◽  
Yi Wei Wang ◽  
Dan Dan Dang ◽  
Jie Si ◽  
Jian Fang Liu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Coupling Reaction ◽  
Crystal Phase ◽  
Sonogashira Reaction ◽  
Sonogashira Coupling ◽  
Liquid Crystal Phase ◽  
Target Compound ◽  
Sonogashira Coupling Reaction ◽  
Phase Behaviors ◽  
Crystal Compound

In order to obtain a novel liquid crystal compound with trifluoromethyl substitutent, Sonogashira coupling reaction was used to synthesize the mesogenic compound based on tolane. Firstly, 1-iodo-4-trifluoromethyl-benzene was modified with acetylene groups, and then coupled with iodo amyl biphenyl through Sonogashira reaction to obtain the target compound. Moreover, the liquid crystal phase behaviors including transition temperatures and phase sequences were investigated by DSC and POM.

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

2014 ◽  
Vol 584-586 ◽  
pp. 1705-1708
Author(s):  
Xiao Ping Huo ◽  
Qi Pei Xu ◽  
Zong Cheng Miao
Keyword(s):  
Liquid Crystal ◽  
Raw Materials ◽  
Coupling Reaction ◽  
Sonogashira Coupling ◽  
Target Compound ◽  
Reaction Conditions ◽  
Silyl Group ◽  
Sonogashira Coupling Reaction ◽  
Optimum Reaction ◽  
Ft Ir

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.

Preparation of Novel Liquid Crystal Material with Trifluoromethyl Substitutent

2013 ◽  
Vol 785-786 ◽  
pp. 690-692
Author(s):  
Yong Ming Zhang ◽  
Yi Wei Wang ◽  
Mei Zhang ◽  
Jian Fang Liu ◽  
Jie Si ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Coupling Reaction ◽  
Sonogashira Coupling ◽  
Reaction Conditions ◽  
H Nmr ◽  
Crystal Material ◽  
Liquid Crystal Material ◽  
Display Area ◽  
Sonogashira Coupling Reaction ◽  
Ft Ir

The liquid crystal material with trifluoromethyl substitutent is a very important liquid crystal monomer to combine mixture in the application of display area. In this paper, a kind of liquid crystal material with trifluoromethyl substitutent was synthesized by traditional method of Sonogashira coupling reaction, the reaction mechanism and reaction conditions were then obtained. In addition, the synthesized compound was characterized by FT-IR and1H-NMR to confirm the consistent structure with target compound.

A coordination driven self-assembled Pd6L8 nanoball catalyses copper and phosphine-free Sonogashira coupling reaction in both homogeneous and heterogeneous formats

2016 ◽  
Vol 40 (8) ◽  
pp. 7140-7147 ◽  
Author(s):  
Subhashis Pradhan ◽  
Subhadip Dutta ◽  
Rohith P. John
Keyword(s):  
Aqueous Medium ◽  
Coupling Reaction ◽  
Sonogashira Reaction ◽  
Catalyst Loading ◽  
Sonogashira Coupling ◽  
Aerobic Conditions ◽  
Homogeneous Phase ◽  
Sonogashira Coupling Reaction ◽  
Self Assembled ◽  
Heterogeneous Phase

A self-assembled Pd6L8 nanocage catalysed copper free Sonogashira reaction under mild and aerobic conditions, at 100 ppm catalyst loading in aqueous medium in the homogeneous phase, and at 500 ppm in the heterogeneous phase.

Synthesis and Mesomorphism of a Novel Triphenylene-Based Discotic Liquid Crystal with Chiral Chain

2012 ◽  
Vol 557-559 ◽  
pp. 1062-1065 ◽  
Author(s):  
Ming Xia Zhang ◽  
Yi Fei Wang ◽  
Chun Xiu Zhang ◽  
Hao Wu ◽  
Jia Ling Pu
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Ir Spectra ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Phase Transition Behavior ◽  
Chemical Structures ◽  
Discotic Liquid Crystal ◽  
Ft Ir ◽  
Crystal Compound

A novel triphenylene-based discotic liquid crystal compound was synthesized in this study. The chemical structures of compounds were characterized by 1HNMR spectra, FT-IR spectra and were confirmed. The phase transition behavior was studied in the combination of texture observation by DSC and POM equipped with a temperature-controllable hot-stage. The object compound showed liquid crystal phase and the results showed that columnar liquid crystal phase between 90.1°C and 138.1 °C during heating.

Synthesis of LC Intermediate Containing Trimethyl Silyl Acetylene Group

2013 ◽  
Vol 781-784 ◽  
pp. 280-282
Author(s):  
Zong Cheng Miao ◽  
Yi Wei Wang ◽  
Yuan Yuan Li ◽  
Lei Zhang ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Raw Materials ◽  
Coupling Reaction ◽  
Sonogashira Coupling ◽  
Reaction Conditions ◽  
Sonogashira Coupling Reaction ◽  
Acetylene Group ◽  
Optimum Reaction

In order to obtain the important liquid crystal intermediate with trifluoromethyl substitutent, Sonogashira coupling reaction was used to synthesize the compound. In this paper, the intermediate was synthesized by 4'-Iodo-4-pentyl-biphenyl and trimethyl silyl acetylene (TMSA) as raw materials. During the synthesis, the optimum reaction conditions were obtained, that the mol ratio of 4'-Iodo-4-pentyl-biphenyl and trimethyl silyl acetylene is 1:2, the reaction temperature is 30 oC, and the reaction time is 10 h.

scholarly journals Linear free-energy correlation analysis of the electronic effects of the substituents in the Sonogashira coupling reaction

2008 ◽  
Vol 86 (5) ◽  
pp. 410-415 ◽  
Author(s):  
Christine Gottardo ◽  
Thomas M Kraft ◽  
M Selim Hossain ◽  
Peter V Zawada ◽  
Heidi M Muchall
Keyword(s):  
Correlation Analysis ◽  
Relative Rate ◽  
Coupling Reaction ◽  
Sonogashira Reaction ◽  
Sonogashira Coupling ◽  
Electronic Effects ◽  
Linear Free Energy ◽  
Competitive Reactions ◽  
Sonogashira Coupling Reaction ◽  
Hammett Correlation

Relative rate constants (krel) for the Sonogashira coupling were determined in competitive reactions between iodobenzene and a series of para- and meta-substituted iodobenzenes and compared to the charge on iodine and the z-component of the quadrupole moment of the iodine-bearing carbon. We use an Hammett correlation analysis and the computational data to provide further evidence that the rate limiting step of the Sonogashira reaction is the initial oxidative addition of Pd to the carbon-iodine bond.Key words: Sonogashira, competitive reactions, Hammett correlation.

Research of Novel Azobenzene Liquid Crystal with High Birefrience and the Phase Behavior

2014 ◽  
Vol 584-586 ◽  
pp. 1673-1676
Author(s):  
Zong Cheng Miao ◽  
Yuan Yuan Li ◽  
Xin Zhang
Keyword(s):  
Liquid Crystal ◽  
Phase Behavior ◽  
Click Chemistry ◽  
Raw Materials ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
H Nmr ◽  
Ft Ir ◽  
Phase Behaviors

In order to obtain an important azobenzene liquid crystal with high birefrience, click chemistry reaction was used to preparation the compound. In this paper, the novle azobenzene liquid crystal was synthesized by (4-Ethynyl-phenyl)-(4-trifluoromethyl-phenyl)-diazene and C8H17Br as raw materials. In addition, the synthesized compound was characterized by FT-IR and1H-NMR to confirm the consistent structure, and the liquid crystal phase behaviors of phase sequences were investigated by polarizingmicroscope (POM).

scholarly journals DNA-supported palladium nanoparticles as a reusable catalyst for the copper- and ligand-free Sonogashira reaction

2017 ◽  
Vol 7 (11) ◽  
pp. 2262-2273 ◽  
Author(s):  
Ana Silvia Camacho ◽  
Iris Martín-García ◽  
Claudia Contreras-Celedón ◽  
Luis Chacón-García ◽  
Francisco Alonso
Keyword(s):  
Heterogeneous Catalyst ◽  
Palladium Nanoparticles ◽  
Coupling Reaction ◽  
Sonogashira Reaction ◽  
Reusable Catalyst ◽  
Sonogashira Coupling ◽  
Mild Conditions ◽  
Sonogashira Coupling Reaction ◽  
Ligand Free ◽  
Supported Palladium

Palladium nanoparticles on DNA have been shown to be an effective and reusable heterogeneous catalyst for the copper- and ligand-free Sonogashira coupling reaction of aryl iodides under mild conditions in air.

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