| 摘要 |
Optically inactive benzo(b)furan, benzo(1,2-b:4,5-b')difuran and benzo(1,2-b:5,4-b')difuran derivatives (I), with mesogenic substituent(s), are new. Optically inactive benzo(b)furan, benzo(1,2-b:4,5-b')difuran and benzo(1,2-b:5,4-b')difuran derivatives of formula (I), with mesogenic substituent(s), are new. R<1>-(A<1>-Z<1>)n-A<2>-Z<2>-W (I) W = a benzofuran-2-yl group of formula (II); X<1-3> = hydrogen (H), fluorine (F), chlorine (Cl) or cyano (CN); X<4>, X<5> = H, F, Cl, CN or a 1-5 C alkyl, 1-5 C alkoxy, 2-12 C alkenyl or 2-12 C alkenyloxy group with 1 or more F substituents; one of X<4> or X<5> = F, Cl or CN if the other = F or CN; or X<4>X<5> = a group, completing a benzodifuran ring system, of formula (IIIA) or (IIIB); X<6>, X<7> = H, F, Cl or CN; or one of X<6>, X<7> = (Z<3>-A<3>)m-R<2>; R<1>, R<2> = H or optionally substituted 1-12 C alkyl or 2-12 C alkenyl; A<1-3> = optionally substituted cycloaliphatic or (hetero)aromatic rings; Z<1-3> = -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2-, -CH=CH-, -C equivalent to C- or a single bond; and m, n, (m + n) = 0, 1 or 2. The full definitions are given in the DEFINITIONS (Full Definitions) Field.
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