It is well known1 that coordination to platinumgroup metals yields simple unsaturated hydrocarbons susceptible to attack by nucleophiles. Studies of the mechanism of this type of reactions have been carried out, mainly on catalytic systems.2 Noncatalytic processes have also been reported and observations on the mechanism presented3 in some cases. A double role has been generally attributed to the metal,4 which is assumed to activate both the unsaturated substrate and the nucleophile, via coordination.
By crystallization of solutions of trans-dichloro(o1efin) [ ( R or 5'-a-phenethylamine] platinum( 11), in which the olefin was propylene, styrene, or trans-2-butene, only one diastereoisomer was obtained. In the case of trans-%butene, it was found that the type of diastereoisomer obtained depended upon the nature of the solvent. By removal of the amine ligand from the complex with trans-2-butene it was possible to obtain the corresponding enantiomeric anion as the Pt( salt.
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