PHENYLDIOXANES

摘要

PCT No. PCT/EP90/02132 Sec. 371 Date Feb. 12, 1991 Sec. 102(e) Date Feb. 12, 1991 PCT Filed Dec. 8, 1990 PCT Pub. No. WO91/09026 PCT Pub. Date Jun. 27, 1991.Phenyldioxanes of the formula I I wherein R1 is an alkyl or alkenyl residue each with up to 16 C atoms, wherein one or two non-adjacent CH2 groups of these residues may be replaced by -CO-O- or -O-CO-, Q1 and Q2 are each independently L1 and L2 are each independently F or H, and Y is Cl, F, CN, CF3, OCF3 or OCF2H, m and n is 0 or 1, are suitable as components of liquid crystal media.