Minghetti, Giovanni and Stoccoro, Sergio and Cinellu, Maria Agostina and Soro, Barbara and Zucca, Antonio (2003) Activation of a C−H bond in a pyridine ring: reaction of 6-substituted 2,2‘-bipyridines with methyl and phenyl platinum(II) derivatives: N‘,C(3)-“rollover” cyclometalation. Organometallics, Vol. 22 (23), p. 4770-4777. eISSN 1520-6041. Article.
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The reaction of the electron-rich derivatives cis-[Pt(R)2(DMSO)2] (R = Me, Ph) with a series of 6-substituted-2,2‘-bipyridines, HL, occurs with loss of methane or benzene, respectively, to yield cyclometalated platinum(II) species [Pt(R)(L)(DMSO)] where L is an anionic ligand N‘,C(3) coordinated. The unusual C−H activation entails a consecutive reaction process through a detectable intermediate. The reaction is peculiar of 6-substituted ligands: for comparison no reaction occurs with 6,6‘-Me2-2,2‘-bipy and an adduct, [Pt(R)2(HL)], is obtained with 5-Me-2,2‘-bipy.
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