| http://www.w3.org/ns/prov#value | - The process can be carried out, although less efficiently, with a smaller amount of the sulfur compound in the range of about 2 or 3 moles per mole of starting compound, and to improve the yield by the addition of about 1 to 3 moles of an alkali metal halide, such as sodium, potassium or lithium chloride, iodide or or bromide. (A similar effect of sodium iodide is shown by Niwa et al., Tet.
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