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We report the chelation-assisted oxidative CH 2  extrusion from a Pt II -coordinated dipyridylmethane, resulting in the formation of a 2,2′-bipyridyl ligand. This unusual one-pot reaction (solvent: dimethylformamide, DMF), which is quantitative, proceeds in air at mildly elevated temperature, with CH 2  → C=O conversion, decarbonylation, and  ipso - ipso  C–C coupling of the two pyridyl residues (“fragment coupling”). It constitutes, in effect, a chelate ring contraction by one member.

zeitschrift für naturforschung b

Metal-mediated C–C bond formation in a platinum(II)-coordinated dipyridylmethane ligand: an unusual example of “ ipso -coupling” with solvent involvement