The oxidation of (oxime)Pt^II species using the electrophilic chlorine-based oxidant N,N-dichlorotosylamide (4-CH₃C₆H₄SO₂NCl₂) was studied. The reactions of trans-[PtCl₂(oxime)₂] (where oxime = acetoxime, cyclopentanone oxime, or acetaldoxime) with this oxidant led to trans-[PtCl₄(oxime)₂] products. The oxidation of trans-[Pt(o-OC₆H₄CH = NOH)₂] at room temperature gave trans-[PtCl₂(o-OC₆H₄CH = NOH)₂], whereas the same reaction upon heating was accompanied by electrophilic substitution of the benzene rings.