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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.

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