| 摘要 |
PCT No. PCT/EP93/02732 Sec. 371 Date Jun. 13, 1995 Sec. 102(e) Date Jun. 13, 1995 PCT Filed Oct. 6, 1993 PCT Pub. No. WO94/10152 PCT Pub. Date May 11, 1994Bifunctional compounds of the formula (I), ne-2,6-diyl or <IMAGE> <IMAGE> is naphthalene-2,6-diyl or <IMAGE> U, X, Y and Z are -CH=, -CF= and -N=, with the proviso that -CF= and -N= may each only be represented at most twice per six-membered ring, and that -CF= and -N= may not at the same time be represented twice in a six-membered ring; Hal is Cl, Br or I; or H, if X and/or Y are -CF=R3 is CH3 or OCH3 l is 0 or 1 m and n are 0, 1, 2 or 3. The compounds of the formula I are useful intermediates for the preparation of liquid-crystalline mixtures.
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