Patent ID: 6849762

Claim:
A process for preparing a trifluoroethoxy-substituted benzoic acid of formula I wherein: R and R 1 are each, independently of one another, A, OA, COOH, COOA, SA, CF 3 , OCF 3 , CN, NO 2 , Hal, —(CH 2 ) p -Hal, —O—(CH 2 ) p -Hal, —S—(CH 2 ) p -Hal, Ar, —(CH 2 ) p —Ar, OAr, O(CO)Ar, NH 2 , NHA, NA 2 , CONH 2 , CONHA or CONA 2 , A is an alkyl radical having from 1-4 carbon atoms, Ar is phenyl or naphthyl, each of which is unsubstituted or monosubstituted, disubstituted or trisubstituted by A, OH, OA, CF 3 , OCF 3 , CN or NO 2 , Hal is F, Cl, Br or I, n is 1, 2, or 3, m and o are each, independently of one another, 0, 1 or 2, p is 1 or 2; comprising introducing potassium tertiary butoxide and tris(polyoxaalkyl)amine in tetrahydrofuran, wherein potassium tertiary butoxide, if they are not introduced together, is subsequently added; adding dropwise 2,2,2-trifluoroethanol; and adding copper(I) bromide and a compound of formula II wherein X is Cl, Br or I, and for n>1, X may be identical or different; to this reaction mixture successively or at the same time in any desired sequence to react the compound of the formula II, and subsequent acidic work-up.