Pyrazolylborate–zinc–thiolate complexes react under mild conditions with methyl iodide, dimethylsulfate and trimethylsulfonium iodide, liberating the corresponding methyl thioethers; the driving force for these reactions lies in the high nucleophilicity of the zinc-bound thiolates and the low donor quality of thioethers toward zinc.
U. Brand, M. Rombach and H. Vahrenkamp, Chem. Commun., 1998, 2717 DOI: 10.1039/A807326K
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