Process for preparing unsymmetrical biaryl alcohols

A process for preparing an unsymmetrical biaryl alcohol, the process comprising anodically dehydrodimerizing, by electrolysis, a monocyclic or bicyclic substituted ortho-alkoxyaryl alcohol of which an alcohol group is bound directly to the aromatic, in the presence of at least one selected mediator from the group consisting of a partially fluorinated mediator and a perfluorinated mediator and a supporting electrolyte,

• wherein the monocyclic substituted ortho-alkoxyaryl alcohol may comprise R1 to R4 as a substituent and the bicyclic substituted ortho-alkoxyaryl alcohol may comprise R1 to R6 as a substituent,
• wherein R1 to R6 are independently selected from the group consisting of a C1-C10-alkyl group, a halogen, an alkylene radical interrupted by oxygen or sulfur, an arylene radical interrupted by oxygen or sulfur, a C1-C10-alkoxycarboxyl, a nitrile, a nitro, and a C1-C10-alkoxycarbamoyl group.