2,3-DIFLUOROBIPHENYLS

摘要

PCT No. PCT/EP89/00180 Sec. 371 Date May 15, 1989 Sec. 102(e) Date May 15, 1989 PCT Filed Feb. 27, 1989 PCT Pub. No. WO89/08687 PCT Pub. Date Sep. 21, 1989.4-Q1-4'-Q2-2,3-Difluorobiphenyls wherein Q1 and Q2 independently of one another are each R or R-A1-A2-Z in which R (sic) alkyl having 1-15 C atoms or alkenyl having 3-15 C atoms each of which is unsubstituted or monosubstituted by cyano or at least monosubstituted by fluorine or chlorine, and in which in each case one or two non-adjacent CH2 groups can also be replaced by -O-, -CO-, -O-CO, -CO-O- or -O-COO-, (sic) -COO-, -O-CO-, -CH2O, -O-CH2-, -CH2CH2- or a single bond, and A1 and A2 independently of one another . . (sic) each 1,4-phenylene which is unsubstituted or substituted by one or two fluorine atoms, and in which one or two CH groups can also be replaced by N, or trans-1,4-cyclohexylene wherein one or two non-adjacent CH2 groups can also be replaced by -O-, and one of the two groups A1 and A2 can also be a single bond, subject to the proviso that Z is -CO-O, -O-CO-, -CH2O-, -OCH2- or -CH2CH2-, if one of the groups Q1 or Q2 is alkyl or alkoxy and the other group Q1 or Q2 is R-A1-A2-Z wherein one of the two groups A1 and A2 is a single bond, are suitable for use as components of liquid-crystal media.