| abstract |
Process for the preparation of 2,5-dihydrofuran derivatives which are substituted in the 3- or 4-position and each carry a C 1 -C 6 -alkoxy radical in the 2- or in the 5-position or in both positions, or in 3- or 4-position substituted 1,1,4,4-tetraalkoxy-but-2-end derivatives (DHF alkoxy derivatives I) from 2,5-dihydrofuran derivatives substituted in 3- or 4-position or C 1 -C 6 alkoxy derivatives of optionally in the 3- or 4-position substituted-2,5-dihydrofuran derivatives with a lower number of alkoxy radicals than the DHF alkoxy derivatives I (DHF alkoxy derivatives II) by adding a compound or mixtures of compounds selected from the group of those in 3- or 4-position substituted-2,5-dihydrofuran derivatives and DHF alkoxy derivatives II, electrochemically oxidized in the presence of a C 1 -C 6 -alkyl alcohol. |