Synthesis and mesomorphic studies on the series of 2-(4-alkoxyphenyl)-5-phenylpyridines and 2-(6-alkoxynaphthalen-2-yl)-5-phenylpyridines

Abstract

Synthesis and mesomorphic studies on the series of 2-(4-alkoxyphenyl)-5-phenylpyridines and 2-(6-alkoxynaphthalen-2-yl)-5-phenylpyridines, Liquid Crystals, 37:1, 23-30, Two homologous series of pyridine-containing liquid crystalline compounds, 2-(4-alkoxyphenyl)-5-phenylpyridines (nO-PPyP, n ¼ 3-7) and 2-(6-alkoxynaphthalen-2-yl)-5-phenylpyridines (mO-NpPyP, m ¼ 3-7), were synthesised. The preparation of compounds of nO-PPyP and mO-NpPyP was completed in a short two-step reaction with overall yields of about 71-80% and 36-40%, respectively. Spectral analyses were in accordance with the expected structures. Their thermotropic behaviours were studied using polarising optical microscopy (POM) and further confirmed by differential scanning calorimetry (DSC). Experimental evidence shows that compounds in the mO-NpPyP series with a slightly tilted hard core display greater nematic tendency than those in the nO-PPyP series with a straight hard core.

Effect of Pyridine on the Mesophase of Teraryl Liquid Crystals: A New Series of Nematic Liquid Crystals Named 2-(4-Alkoxybiphen-4′-yl)-5-methylpyridines

“…We previously reported a novel method for synthesizing pyridine-containing LC compounds [ 20 , 21 , 22 , 23 , 24 , 25 ]. Here, we report a convenient, short two-step synthesis method of a homologous series of 2-(4-alkoxybiphen-4′-yl)-5-methylpyridines ( n O-PPPyMe; n = 3–8; propyloxy to octoxy).…”

A New Series of Kinked Liquid Crystals: 2-(6-Alkoxynaphthalen-2-yl)-6-methoxyquinolines

“…We previously reported a novel method for synthesizing pyridine- and quinoline-containing liquid crystalline compounds [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. These compounds have been attractive synthetic targets because of their chemo- and regioselective reactions, tolerating various functional groups.…”