[16] The liquid crystalline compound recited in paragraph [15] above wherein R1 and Y1 are an alkyl group, both ring A1 and ring A4 are 1,4-cyclohexylene group, both ring A2 and ring A3 are 1,4-phenylene group at least one hydrogen atom of which may be replaced by fluorine atom or chlorine atom, X2 is ???CF2O??? or ???OCF2???, and both X1 and X3 are single bond in the general formula (1).