| abstract |
New di-, tri- and tetra-cyclic cyclohexene derivs. contg. 2,3-difluoro- 1,4-phenylene ring(s) are of formula (I): R1-A1-Z1-A2-(Z2-A3)m-R2 (I) R1 and R2 = 1-15C alkyl or 3-15C alkenyl, opt. with one CN or at least one F or Cl substit., in which a CH2 gp. can be replaced by -O-, -CO-, -O-CO-, -CO-O- or -O-CO-O-; and one of R1 and R2 can also = CN; A1, A2 and A3 = 1,4-cyclohexenylene, trans-1,4-cyclohexylene, in which one or two non-adjacent CH2 gps. can be replaced by -O-, or 1,4-phenylene, opt. with one or two F substits., in which one or two CH gps. can be replaced by N, at least one of A1-3 being = 2,3-difluoro- 1,4-phenylene and at least one = 1,4-cyclohexenylene; Z1 and Z2 = -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2- or a single bond. (I) can be prepd. (not claimed) by standard methods, as described e.g., in Houben-Weyl, Methoden der Organischen Chemie, Georg-Thieme-Verlag, Stuttgart. |