Patent ID: 8703012

Claim:
A liquid crystal composition containing at least one compound selected from the group of compounds represented by formula (1) as a first component: wherein R 1 is hydrogen or alkyl having 1 to 20 carbons, and in the alkyl, arbitrary —CH 2 — may be replaced by —O—, —CH═CH— or —C≡C—, R 2 and R 3 are hydrogen or methyl; A 1 is a single bond, 1,4-phenylene or 1,4-cyclohexylene; Z 1 is a single bond or alkylene having 1 to 3 carbons; Z 2 is —O— or alkylene having 1 to 6 carbons; Z 3 is a single bond or —O—; Z 4 is a single bond or alkylene having 2 to 20 carbons, and in the alkylene, arbitrary —CH 2 — may be replaced by —O—; X 1 is hydrogen, halogen, alkyl having 1 to 3 carbons or fluoroalkyl having 1 to 3 carbons; a is 0 or 1; and in the formula, arbitrary hydrogen on an arbitrary phenylene ring may be replaced by methyl, cyclohexyl or halogen.