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Notes 5737 1062. Alkylplatinum Chlorides By S. F. A. KETTLEIT is a remarkable fact that although trimethylplatinum compounds were first reported by Pope and Peachey in 1907,l and have now a fairly extensive chemistry, no analogous compound containing a different alkyl group has ever been reported, although several attempts have been made to synthesise such compounds.2We now report a more general method for the preparation of the trialkylplatinum halides. The method is simple, gives fairly good yields, and leaves the metal as the only platinum by-product, so facilitating recovery.Experimental. Dimethylmercury (4.0 g.) was added dropwise to a solution of anhydrous platinum tetrachloride (1.3 g.) in acetone (50 ml.) cooled to -78" until reaction ceased. The black solution was then refluxed until the initially colloidal platinum was precipitated, leaving a pale yellow solution. Removal of solvent followed by vacuum sublimation gave 90% of the methylmercuric chloride required by 3HgMe, + PtCI, __t 3MeHgCI + Me,PtCI.