Patent ID: 7255900

Claim:
A compound of formula (I), wherein R 1 and R 2 are, each independently, a) H b) a straight-chain or branched alkyl radical having 1 to 16 carbon atoms, or a straight-chain or branched alkenyl radical having 2 to 16 carbon atoms, in which b1) one or more nonadjacent and nonterminal CH 2 groups may be replaced by —O—, —C(═O)O—, —O—C(═O)—, —O—C(═O)—O—, —C(═O)— or —Si(CH 3 ) 2 — and/or b2) one CH 2 group may be replaced by —C≡C—, cyclopropane-1,2-diyl, cyclobutane-1,3-diyl, cyclohexane-1,4-diyl or phenylene-1,4-diyl and/or b3) one or more hydrogen atoms may be replaced by F and/or Cl, c) —M 1 —A 1 —R 5 , p, q are, each independently, 0 or 1, and in case p or q is zero, —H is present instead of —F, M 1 is —CO—O—, —O—CO—, —CH 2 —O—, —O—CH 2 —, —CF 2 —O—, —O—CF 2 —, —CH═CH—, —CF═CF—, —C≡C—, —CH 2 —CH 2 —CO—O—, —O—CO—CH 2 —CH 2 —, —CH 2 —CH 2 —, —CF 2 —CF 2 —, —(CH 2 ) 4 —, —OC(═O)CF═CF— or a single bond, A 1 is 1,4-phenylene in which one or two hydrogen atoms may be replaced by F, Cl, CN and/or OCF 3 , or three hydrogen atoms may be replaced by fluorine, 1,4-cyclohexylene in which one or two hydrogen atoms may be replaced by CH 3 and/or F, 1-cyclohexene-1,4-diyl in which one hydrogen atom may be replaced by CH 3 or F, pyrimidine-2,5-diyl, pyridine-2,5-diyl or 1,3-dioxane-2,5-diyl R 5 has the same definition as specified for R 1 and R 2 , with the exception of —M 1 —A 1 —R 5 , but independently of the definition of R 1 and R 2 , X is H, F, OCF 3 , CF 3 , or OCF 2 H, with the following provisos: a) at least one of p, q has to be 1, b) R 1 and R 2 must not at the same time be H, c) R 2 and X must not at the same time be H.