| abstract |
The present invention relates to a process for preparing compounds of the formula ABA n n n n n n n n n n by reacting a compound of the formula (A) n n n n n n n n n n with a compound of the formula (B) n n n n n n n n n n with X═—OR′ or —NHR′ and R′═H or a protecting group function and R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are each independently selected from the group comprising hydrogen, (C 1 -C 12 )-alkyl, O—(C 1 -C 12 )-alkyl, (C 6 -C 20 )-aryl, O—(C 6 -C 20 )-aryl, where two of the R 1 to R 4 radicals may also be joined via a covalent bond, and halogen, which is characterized in that the reaction is conducted electrochemically. |