| http://www.w3.org/ns/prov#value | - In the case of the thio derivatives, there are additional suitable activating agents which may be employed, such as for example, loweralkyl halides (methyl halide being preferred), methyl tosylate, methyl sulfonic acid esters (e.g., methyl methanesulfonate) methyl trifluoromethylsulfonate, and the like.
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