Patent ID: 6159561
Filing Date: 2000-12-12
Classification: C07C,C07D,C07F,C09K

Abstract:
A 1,3-difluoronaphthalene derivative of the formula (I)R.sup.1 (--A.sup.1 --M.sup.1).sub.a (--A.sup.2 --M.sup.2).sub.b --B(--M.sup.3 --A.sup.3).sub.c (--M.sup.4 --A.sup.4).sub.d --R.sup.2 (I)in which the symbols and indices have the following meanings: group B is ##STR23## R.sup.1 and R.sup.2 are identical or different and are a) hydrogen, --F, --Cl, --CF.sub.3 --OCF.sub.3 or --CN, orb) a straight-chain or branched alkyl radical (with or without an asymmetric carbon atom) having 1 to 20 carbon atoms, whereb.sub.1) one or more nonadjacent and nonterminal CH.sub.2 groups can be replaced by --O--, --CO--O, --O--CO-- or --Si(CH.sub.3).sub.2 --, and/orb.sub.2) one or more CH.sub.2 groups can be replaced by --CH.dbd.CH--, --C.dbd.--C--, 1,4-phenylene, 1,4-cyclohexylene and/orb.sub.3) one or more H atoms can be replaced by F and/orb.sub.4) the terminal CH.sub.3 group can be replaced by one of the following chiral groups (optically active or racemic): ##STR24## with the proviso that at most one of the radicals R.sup.1, R.sub.2 can be hydrogen, --F, --Cl, --CF.sub.3, --OCF.sub.3 or --CN;R.sup.3 is a straight-chain or branched alkyl radical (with or without an asymmetric carbon atom) having 1 to 16 carbon atoms, where1) one or more nonadjacent and nonterminal CH.sub.2 groups can be replaced by --O--, and/or2) one or two CH.sub.2 groups can be replaced by --CH.dbd.CH--;M.sup.1, M.sup.2, M.sup.3, and M.sup.4 are identical or different and are --CO--O--, O--CO--, --CH.sub.2 --O--, --O--CH.sub.2 -- --C.tbd.C--, or a single bond;A.sup.1, A.sup.2, A.sup.3, and A.sup.4 are identical or different and are 1,4-phenylene in which one or more H atoms can be replaced by F, pyridine-2,5-diyl in which one or more H atoms can be replaced by F, pyrimidine-2,5-diyl in which one H atom can be replaced by F, 1,4-cyclohexylene in which one or two H atoms can be replaced by CN and/or CH.sub.3 and/or F, 1 ,3-dioxane-2,5-diyl, naphthalene-2,6-diyl in which one or two H atoms can be replaced by F, Cl and/or CN, or 1-(C.sub.1 -C.sub.4)alkyl-1-silacyclohexylene-1,4-diyl;a, b, c, and d are 0 or 1; with the proviso that the compound of the formula (I) contains no more than four ring systems having five or more members, with the exception of compounds having not more than 3 five- or more member ring systems, andR.sup.1 C.sub.1-20 -alkyl in which non terminal non neighboring CH.sub.2 -groups can be replaced by --O--, wherein the CH.sub.2 -group directly bound to A.sup.1, A.sup.2 or B is replaced by --CH.dbd.CH--, and M.sup.1 =M.sup.2 =M.sup.3 =M.sup.4 =single bond, orR.sup.2 C.sub.1-20 -alkyl in which non terminal non neighboring CH.sub.2 -groups can be replaced by --O--, wherein the CH.sub.2 -group directly bound to A.sup.4, A.sup.3 or B is replaced by --CH.dbd.CH--, and M.sup.1 =M.sup.2 =M.sup.3 =M.sup.4 =single bond.