Effect of lateral substitution by chlorine and fluorine atoms of 4-alkyl-p-terphenyls on mesomorphic behaviour
作者:Marta Pytlarczyk、Ewelina Dmochowska、Michał Czerwiński、Jakub Herman
DOI:10.1016/j.molliq.2019.111379
日期:2019.10
The effect of halogen substitution on thermotropic liquid crystalline materials has a significant impact on many physical and chemical properties. Replacement of hydrogen atom by one of halogen can change and tune many important parameters such as dielectric anisotropy, viscosity, clearing and melting points, type and range of liquid crystallinephase and many others. Steric effect of halogen atoms
Multikilogram Scale Organolithiation Chemistry for the Manufacture of Liquid Crystal Intermediates
作者:Yao-Hua Han、Ting Zhou、Yan Sui、Ruimao Hua
DOI:10.1021/op500133p
日期:2014.10.17
This paper describes the kilogram-scale regioselective synthesis of various fluorinated arylboronic acids, aryl iodides, aryl acids, aryl aldehydes, and cyclohexenyl-substituted aryls in good to high yields via in situ fluorine-directed ortho-lithiation of fluorinated aryls and their subsequent reactions in a one pot manner with nudeophiles such as triisobutyl borate, iodine, carbon dioxide, N,N dimethylformamide, and cyclohexyl ketones.