Patent ID: 7999123

Claim:
A 2-oxetanone derivative represented by the general formula (1): wherein R 1 is hydrogen, alkyl having 1 to 20 carbons, halogen, —C≡N, —C≡C—C≡N, —N═C═O or —N═C═S, wherein arbitrary hydrogen may be replaced by halogen in the alkyl; A 1 , A 2 , A 3 and A 4 are each independently 1,4-cyclohexylene, 1,4-phenylene in which arbitrary hydrogen may be replaced by fluorine, decahydronaphthalen-2,6-diyl, 1,2,3,4-tetrahydronaphthalen-2,6-diyl or naphthalen-2,6-diyl, provided that when A 1 , A 2 and A 3 are each 1,4-cyclohexylene, the steric configuration thereof is trans, and when A 4 is 1,4-cyclohexylene, the steric configuration thereof may be trans, cis or a mixture of trans and cis; Z 1 , Z 2 , Z 3 and Z 4 are each independently a single bond, —CH 2 CH 2 —, —(CH 2 ) 4 —, —CH 2 O— or —OCH 2 —; j and k are each independently 0 or 1; l and m are 1; and n is an integer of from 0 to 6.