Catalyst composition for biaryl synthesis by decarboxylative cross-coupling

A composition comprising

• (i) a palladium compound which is selected from a palladium salt or a palladium complex or a mixture thereof;
• and
• (ii) at least one of the following compounds:
• a compound of Formula (I)
• wherein
• R1 to R10 are selected independently from each other from hydrogen, and
• C1-4alkyl;
• or at least two of the residues R1 to R10 which are adjacent to each other form together with the carbon atoms to which they are attached a six-membered aromatic ring and, if present, the remaining residues are selected independently from each other from hydrogen and C1-4alkyl;
• a compound of Formula (II)
• wherein
• R1 to R8 are selected independently from each other from hydrogen, C1-4alkyl and cyano;
• or at least two of the residues R1 to R8 which are adjacent to each other form together with the carbon atoms to which they are attached a six-membered aromatic ring and, if present, the remaining residues are selected independently from each other from hydrogen, C1-4alkyl and cyano;
• an iridium complex comprising ligands L1, L2 and L3, wherein the ligands L1, L2 and L3 are selected independently from each other from a phenylpyridine and a bipyridine.