Halogenated benzene derivatives, and a liquid-crystalline medium

摘要

PCT No. PCT/EP90/01437 Sec. 371 Date Nov. 15, 1990 Sec. 102(e) Date Nov. 15, 1990 PCT Filed Aug. 30, 1990 PCT Pub. No. WO91/03445 PCT Pub. Date Mar. 21, 1991.The invention relates to novel halogenated benzene derivatives of the formula I <IMAGE> I in which n is 1 to 7 [sic], the rings A and B are each trans-1,4-cyclohexylene, or one of the rings A and B is alternatively 1,4-phenylene or 3-fluoro-1,4-phenylene, X is F, Cl, -CHF2, -CF3, -CN, -OCF3 or -OCHF2, Y and Z are each, independently of one another, H or F, r=1 or, in the case where s=1, B=trans-1,4-cyclohexylene and simultaneously X=CHF2, -CF3, -OCF3 or -OCHF2, r is alternatively 0, and s=1 or, in the case where B=1,4-phenylene or 3-fluoro-1,4-phenylene, s=0.