| abstract |
Chiral and/or achiral cpds. (I) contg. thiazol-2,4-diyl, thiazol-2,5-diyl, 1,3,4-thiadiazol-2,5-diyl and/or 1,2,4-thiadiazol-3,5-diyl gp(s). are used as components of media with smectic liquid crystal (LC) phase. (I) are pref. of formula R1-A1-Z1-A2-(Z2-A3)n-R2 (IA); where A1-3 = 1,4-phenylene, opt. with halogen, CN and/or alkyl substit(s)., in which one or more CH gps. are replaced by H; 1,4-cyclohexylene, opt. substd. by CN, in which one or 2 non-adjacent CH2 gps. can be replaced by O and/or S; 1,4-bicyclo- (2,2,2)-octylene; piperidin-1,4-diyl; naphthalene-2,6-diyl; decahydronaphthalene-2,6-diyl; or 1,2,3,4-tetrahydro naphthalene-2,6-diyl; R1-2 = 1-15C alkyl; a gp. derived from this and contg. -O-, -S-, -CO-, -O-CO-, -CO-O-, -CO-S-, -S-CO-, -CH(halogen)-, -CF2-, -CH(CN)-, -C(alkyl)CN-, -CH=CH- and/or -CC- and opt. with an asymmetrical C atom giving optical activity, in which 2 hetero-atoms are not directly linked; and one of R1-2 can also = F, Cl, Br, CN, COOH, OH, SH, NH2, NO2 or -NCS; Z1-2 = -CO-O-, -O-CO-, -CH2CH2-, -CH2-O-, -OCH2-, -N=N-, -NO=N-, -CH=N- or a single bond and one of Z1-2 can also be = -CH2-, -O-, -CO-, -Cn(CN)-, -CH(halogen), -CH2CH2CH2-, -CH2-COO- or -CH2OCO-; n = 0, 1, 2 or 3; provided that R1 and/or R2 = 4-15C alkyl, in which at least one CH2 gp. is replaced by -C(alkyl)CN- and one or more other CH2 gps. can be replaced by -O-, -S-, -CO-, -O-CO-, -CO-O-, -CO-S-, -S-CO-, -CH(halogen)-, -CF2-, -CH(CN)-, -CH=CH- and/or -CC-. (I) can be prepd. (not claimed) by standard methods, e.g. as described in Houben-Weyl, Methoden der Organischen Chemie, Georg-Thieme-Verlag, Stuttgart. |