| abstract |
A polar compound having a high chemical stability, a high ability to align liquid crystal molecules, a high solubility in a liquid crystal composition, and a high voltage holding ratio when used in a liquid crystal display device. The compound represented by the formula (1) is used. For example, R 1 is alkyl of 1 to 15 carbon atoms; MES is a mesogenic group having at least one ring; Sp 1 is a single bond or alkylene having 1 to 10 carbon atoms; M 1 and M 2 are hydrogen; R 2 is a group represented by formulas (1a) to (1c): Sp 2 and Sp 3 are a single bond or alkylene having 1 to 10 carbon atoms; S 1 is >CH-; S 2 is> C <; X 1 is -OH. |