Patent ID: 6762315
Filing Date: 2004-07-13
Classification: C07C

Abstract:
A method for producing [1,1â€²:4â€²,1â€³]-terphenyl compounds of the formula in which R is hydrogen or a straight-chain or branched C1-CH4-alkyl radical, R1 is hydrogen, a straight-chain or branched C1-C4-alkyl radical or a straight-chain or branched C1-C4-alkoxy radical and R2 is hydrogen, a straight-chain C1-C12-alkyl radical, an unsubstituted phenyl radical, a phenyl radical which is substituted by one or two C1-C4-alkyl groups or C1-C4-alkoxy groups, or a radical â€”(CH2)xOR3 in which x is an integer from 1 to 4 and R3 is a straight-chain or branched C1-C4-alkyl radical, which comprises reacting a metal aryl and the formula in which A is a monovalent metal or MeX, where Me is a divalent metal and X is Cl, Br or I, and R2 is A or a trisubstituted silyl radical, or has the meaning indicated in formula (1), excepting hydrogen, with a boric ester at âˆ’80 to 40Â° C. in the presence of an inert solvent, converting the reaction product by hydrolysis into a boronic acid of the formula reacting the boronic acid, a boronic anhydride obtainable from boronic acid by elimination of water, or a mixture of boronic acid and boronic anhydride, with an alcohol, and reacting the boronic ester formed thereby with a biphenyl compound of the formula in which R and R1 have the meaning indicated in formula (1) and D is Cl, Br, I, O3Sâ€”CnF2n+1, where n is an integer from 1 to 4, or N2+Yâˆ’ where Yâˆ’ is CIO4âˆ’, BF4âˆ’ or HSO4âˆ’, at 40 to 180Â° C. in the presence of a catalyst, of an acid-binding agent and of a polar solvent.