| 主权项 |
1. A compound of formula I
Rt1-(Ar1)a-(Ar2)b-[(Ar3)c-(Ar4)d-U-(Ar5)e-(Ar6)f]n-(Ar7)g-(Ar8)h-Rt2 I wherein U is a divalent group of the following structure Ar1-8 independently of each other denote —CY1═CY2—, —C≡C—, or aryl or heteroaryl that has 5 to 30 ring atoms and is unsubstituted or substituted by one or more groups R or R1, and one or more of Ar1-8 may also denote U, and wherein those of Ar1-8 that are directly adjacent to a group U are different from phenyl and naphthyl, Y1, Y2 independently of each other denote H, F, Cl or CN, R1-4 independently of each other denote H, F, Cl, —CN, CF3, R, —CF2—R, —S—R, —SO2—R, —C(O)—R, —C(S)—R, —C(O)—CF2—R, —C(O)—OR, —C(S)—OR, —O—C(O)—R, —O—C(S)—R, —C(O)—SR, —S—C(O)—R, —C(O)—NRR′, —NR′—C(O)—R, —CR′═CR″R′″, R is alkyl with 1 to 30 C atoms which is straight-chain, branched or cyclic, and is unsubstituted, substituted with one or more F or Cl atoms or CN groups, or perfluorinated, and in which one or more C atoms are optionally replaced by —O—, —S—, —C(O)—, —C(S)—, —SiR0R00—, —NR0R00—, —CHR0═CR00— or —C≡C— such that O- and/or S-atoms are not directly linked to each other, R0, R00 independently of each other denote H or C1-10 alkyl, R′, R″, R′″independently of each other have one of the meanings of R or denote H, Rt1,t2 independently of each other denote H, F, Cl, Br, —CN, —CF3, R, —CF2—R, —O—R, —S—R, —SO2—R, —SO3—R—C(O)—R, —C(S)—R, —C(O)—CF2—R, —C(O)—OR, —C(S)—OR, —O—C(O)—R, —O—C(S)—R, —C(O)—SR, —S—C(O)—R, —C(O)NRR′, —NR′—C(O)—R, —NHR, —NRR′, —CR′═CR″R′″, —C≡C—R′, —C≡C—SiR′R″R′″, —SiR′R″R′″, —CH═C(CN)—C(O)—OR, —CH═C(COOR)2, CH═C(CONRR′)2, CH═C(CN)(Ar9), Ra, Rb are independently of each other aryl or heteroaryl, each having from 4 to 30 ring atoms and being unsubstituted or substituted with one or more groups R or R1, Ar9 is aryl or heteroaryl, each having from 4 to 30 ring atoms and being unsubstituted or substituted with one or more groups R or R1, a-h are independently of each other 0 or 1, with at least one of a-h being 1, n is 1, 2 or 3. |
