M. Beley et al., SYNTHESIS OF BIS-CYCLOMETALLATING N-C-N HEXADENTATE LIGANDS VIA C-C AROMATIC COUPLINGS AND THEIR DINUCLEAR RUTHENIUM(II) COMPLEXES, Tetrahedron letters, 34(18), 1993, pp. 2932-2936
By combining palladium catalyzed C-C coupling procedures either based
on aromatic stannanes or utilizing boronic acids or esters (Suzuki's r
eaction), various bis-cyclometallating N-C-N ligands could be prepared
. Their di-ruthenium(II) complexes have also been synthesized.