A mesomorphic compound represented by the following formula [I]: ##STR1## wherein R.sub.1 and R.sub.2 independently denote an alkyl group having 1-16 carbon atoms capable of having a substituent; X.sub.1, X.sub.2, X.sub.3 and X.sub.4 independently denote a single bond ##STR2## A.sub.1, A.sub.2 and A.sub.3 independently denote ##STR3## X.sub.5 and X.sub.6 independently denote hydrogen atom, fluorine, chlorine, bromine, CH.sub.3, CN or CF.sub.3 ; n.sub.1 and n.sub.2 are 0 or 1, with provisos that (1) X.sub.2 cannot be a single bond when n.sub.1 is 0, (2) X.sub.3 cannot be a single bond when N.sub.2 is 1 and (3) at least one of X.sub.2 and X.sub.3 denotes ##STR4## when both n.sub.1 and n.sub.2 is O and A.sub.2 denote ##STR5##
以下是公式[I]所代表的一种中间化合物:其中R₁和R₂分别表示具有1-16个碳原子的烷基基团,可以具有取代基;X₁、X₂、X₃和X₄分别表示单键;A₁、A₂和A₃分别表示;X₅和X₆分别表示氢原子、
氟、
氯、
溴、CH₃、CN或CF₃;n₁和n₂为0或1,但有以下规定:(1)当n₁为0时,X₂不能是单键,(2)当n₂为1时,X₃不能是单键,(3)当n₁和n₂都为0时,X₂和X₃中至少有一个表示。A₂表示。