| 摘要 |
PCT No. PCT/EP91/02148 Sec. 371 Date Feb. 11, 1992 Sec. 102(e) Date Feb. 11, 1992 PCT Filed Nov. 14, 1991 PCT Pub. No. WO92/09576 PCT Pub. Date Jun. 11, 1992.The invention relates to halopyridines of the formula I <IMAGE> I in which L is Cl or F, and R1, R2, A1, A2, Z1, Z2, m and n are as defined in patent claim 1, and the use thereof as components of liquid-crystalline, in particular ferroelectric, media.
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