Synthesis of polyfluorinated polycyano negative dielectric anisotropy liquid crystalline compounds was written by Guo, Jian;Sui, Yan;Cao, Jian-hua;Meng, Jin-song;Hua, Rui-mao. And the article was included in Yejing Yu Xianshi in 2014.Reference of 64248-57-3 This article mentions the following:
In order to meet the different demands of the LCD, two novel polyfluorinated polycyano neg. dielec. anisotropy liquid crystalline compounds were synthesized. These compounds were synthesized from phthalonitrile and 1,2-difluorobenzene by several steps. Their constructions were confirmed by NMR and elemental anal. The parameters and the performances of these products were measured by POM, DSC and rotary viscometer. These polyfluorinated polycyano compounds have small optical anisotropy (Δn=0.096-0.107), large neg. dielec. anisotropy (Δε= -15.2 – -16.7) and high viscosity (γ1=234.8-248.6 mPa6f0s). These compounds can be used in the LCD matrix to improve partial performance of the LCD. The preparation method is of simple operation and low cost, which can also realize industrialization easily. In the experiment, the researchers used many compounds, for example, 1,2-Difluoro-3-iodobenzene (cas: 64248-57-3Reference of 64248-57-3).
1,2-Difluoro-3-iodobenzene (cas: 64248-57-3) belongs to iodide derivatives. Organoiodine compounds occur widely in organic chemistry, but are relatively rare in nature. Alkyl iodides react at a faster rate than alkyl fluorides due to the weak C-I bond.Reference of 64248-57-3
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com