| abstract |
Cross-linking of boronic acid of formula (II), borin acid or boronic anhydride derived therefrom with chlorine, bromine or iodine of formula (III) in a solvent / water mixture in the presence of a transition metal catalyst and a water-soluble borate Process for preparing a compound of the general formula (I) by coupling:n n n n n n n n n n n n n n n n n n In the above formula,n n n R 1 and R 2 in each occurrence are independently C 1 to C 15 alkyl, alkoxy or alkylene radicals, unsubstituted or at least monosubstituted with halogen, in which one or more CH 2 groups independently of one another are -O -, -S-, , , -CO-, -CO-O-, -O-CO- or -O-CO-O (0 atoms are not directly connected to each other) and R 2 is -H, -CN,- NH 2 , -NCS, -Cl, -F, -CF 3 , -OCF 3 , -OCF 2 H or -OC 2 F 5 , -COOH, -OH or -OCH 2 Ph, A 1 , A 2 And A 3 in each occurrence independently of one another is (a) a trans-1,4-cyclohexylene radical, in which one or more non-adjacent CH 2 groups can also be substituted with -O- and / or -S-, ( b) 1,4-phenylene radicals in which one or two CH groups may also be substituted by N, or (c) 1,4-cyclohexenylene, 1,4-bicyclo [2.2.2] -jade Methylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl and Radicals selected from the group comprising: radicals (a) and (b) may be substituted by substituents having the meanings of R 1 and R 2 , and x 1 , x 2 , x 3 and x 4 are independently of one another R 1 or R 2 , Z 1 and Z 2 in each occurrence independently of one another are -CO-O-, -O-CO-, -CH 2 O-, -OCH 2- , -CH 2 CH 2- , -CH = CH-, -C = C- or a single bond, m and n are 0, 1 or 2 and Y is Cl, Br or I. |