| 摘要 |
PCT No. PCT/EP92/00478 Sec. 371 Date Sep. 15, 1993 Sec. 102(e) Date Sep. 15, 1993 PCT Filed Mar. 4, 1992 PCT Pub. No. WO92/16483 PCT Pub. Date Oct. 1, 1992.The invention relates to methylenecyclobutane derivatives of the formula I <IMAGE> I in which R1, A1, A2, Z1, Z2, L1, L2, X, Y and m are as defined in claim 1, and to the use thereof as a component of liquid-crystalline media for electrooptical displays.
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