Jiharogenoshiano compound, liquid crystal composition and liquid crystal electro-optical element

摘要

PURPOSE:To provide a novel dihalogenocyano compound employed as a liquid crystal electrooptical element, having extremely high positive dielectric anisotropy, excellent compatibility with other liquid crystal materials or non- liquid crystal materials and excellent chemical stability and suitable for lowering a voltage for driving liquid crystals, etc. CONSTITUTION:A dihalogenocyano compound of formula I [A1-A3 are trans-1,4- cyclohexylene, 1,4-phenylene (capable of being substituted with one or more of halogen, methyl and nitrile groups); Y1, Y2 are COO, O, OCO, CH2CH2, CH=CH, single, etc.; R is H, alkyl (capable of being substituted); X1, X2 are Cl, F; m, n are 0.1], e.g. a compound of formula II. The compound of formula I is produced, e.g. by reacting a compound of formula III with a 2,6-dihalogeno-4- hydroxybenzonitrile of formula IV in the presence of an alkali.