USE OF A CATALYST COMPOSITION FOR BIARYL SYNTHESIS BY DECARBOXYLATIVE CROSS-COUPLING

The present invention relates to a process for coupling a heterocyclic aromatic ring AR1 and a carbocyclic or heterocyclic aromatic ring AR2 to each other by a light-assisted decarboxylative carbon-carbon cross-coupling reaction, wherein- a reaction medium is provided by mixing a first reactant, a second reactant and a catalyst composition, wherein the catalyst composition comprises(i) a palladium compound which is a palladium salt or a palladium complex or a mixture thereof, and(ii) a polycyclic compound of Formula (I), (II) or (III):- the reaction medium is irradiated by an external light source, thereby coupling the heterocyclic aromatic ring AR1 of the first reactant to the aromatic ring AR2 of the second reactant by a decarboxylative carbon-carbon cross-coupling reaction.