Complexes [PtMe 2 (NN)], with NN = 2,2′-bipyridine (bipy), 4,4′-ditert-butyl-2,2′-bipyridine (bu 2 bipy), di-2-pyridylamine (dpa), or di-2-pyridyl ketone (dpk), react easily with phthaloyl peroxide to give a mixture of the chelate complex [PtMe 2 {κ 2 -O,O′-1,2-(O 2 C) 2 C 6 H 4 }(NN)], which was structurally characterized when NN = bu 2 bipy, and an oligomer or polymer [PtMe 2 {μ-κ 2 -O,O′-1,2-(O 2 C) 2 C 6 H 4 }-(NN)] n . In the case with NN = dpa, no phthalate chelate complex is formed. These complexes are easily hydrolyzed, and the complexes cis-[PtMe 2 (OH){κ 1 -O-O 2 CC 6 H 4 -2-CO 2 H}(bipy)] and trans-[PtMe 2 {κ 1 -O-O 2 CC 6 H 4 -2-CO 2 H}(dpkOH)]have been structurally characterized. It is argued that the oxidative addition of phthaloyl peroxide occurs by a polar mechanism and that the hydrolysis is easy because there is no special stability associated with the seven-membered platinumphthalate chelate ring.

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