The unique bonding and the variety of structures presented by metal-olefin compounds have provided the stimulus for recent study of this class of compounds. Although many aspects of the bonding and structure of these compounds are still obscure, several general methods have been developed for their synthesis. The following series of preparations deals with the metal-olefin compounds containing more than one double bond in the hydrocarbon moiety. These preparations illustrate methods that may readily be adapted to the preparation of a number of metal-olefin compounds in which the hydrocarbon is a diolefin. (11) 2KzPtC14 + C4Hs -+ K2(C13PtC4H,PtC13) + 2KC1 Chatt' has prepared and investigated this complex and presented evidence to show that the butadiene acts as a bridging group between two PtC1,-units. The present preparation represents a slight modification of his procedure particularly with regard to the control of the acidity of the potassium tetrachloroplatinate(I1) solution. Procedure A. POTASSIUM HEXACHLOROp-1,4-BUTADIENE-DIPLATINATEOne gram of dry potassium tetrachloroplatinate(I1) $ is dissolved in 15 ml. of 5 '% hydrochloric acid. The container is thoroughly flushed with gaseous butadiene and then charged with butadiene to a pressure of 100 cm. The pres-
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