38361-37-4Relevant articles and documents
Chlorofluorobenzene liquid crystal compound, liquid crystal composition, and liquid crystal display device
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, (2008/06/13)
Such a liquid crystal compound is provided that has stability to heat, light and so forth, has a nematic phase in a wide temperature range, has a small viscosity, a suitable optical anisotropy, and suitable elastic constants K33 and K11 (K33: bend elastic constant, K11: splay elastic constant), and has suitable negative dielectric anisotropy and excellent compatibility with other liquid crystal compounds. A liquid crystal composition containing the liquid crystal compound, and a liquid crystal display device containing the liquid crystal composition are also provided. The liquid crystal compound is represented by one of formulas (a) to (d), the liquid crystal composition contains the liquid crystal compound, and the liquid crystal display device contains the liquid crystal composition: wherein Ra and Rb are independently linear alkyl or linear alkoxy, rings A1, A2, B and C are independently trans-1,4-cyclohexylene or 1,4-phenylene, Z11, Z12, Z2 and Z3 are independently a single bond or alkylene, and one of X1 and X2 is fluorine, and the other thereof is chlorine.
A Convenient Synthesis of High-Purity 1-Chloro-2,6-difluorobenzene
Moore Jr., Robert M.
, p. 921 - 924 (2013/09/05)
A convenient preparation of high-purity 1-chloro-2,6-difluorobenzene has been developed. The key to the isolation of the desired isomer, without contamination of the difficult-to-separate isomer 1-chloro-2,3-difluorobenzene, is the use of sulfonyl chloride to direct fluorine substitution to the ortho and para positions of the aryl ring. Although activation with sulfonyl chloride requires additional reaction steps, the process results in good overall yield and requires only low-cost commodity chemicals. The high-purity 1-chloro-2,6-difluorobenzene is useful as an intermediate for active ingredients in agricultural and pharmaceutical applications.
AROMATIC FLUORINE CHEMISTRY. PART 5. PREPARATION OF 2,6-DIFLUOROANILINE AND 1,2-DIFLUOROBENZENE
Pews, R. Garth,Gall, James A.
, p. 379 - 386 (2007/10/02)
The preparation of 2,6-difluoroaniline and 1,2-difluorobenzene from 1,2,3-trichlorobenzene is described.An isomeric mixture of 1-chloro-2,3-difluorobenzene and 2-chloro-1,3-difluorobenzene is obtained from KF exchange on 1,2,3-trichlorobenzene.Selective dechlorination of 1-chloro-2,3-difluorobenzene with H2 and Pd/C catalyst gives 1,2-difluorobenzene. 2,6-difluoroaniline is obtained via ammonolysis of 2-chloro-1,3-difluorobenzene.