| http://www.w3.org/ns/prov#value | - Examples of the halogenating agent (c) used in the reaction include halogens such as fluorine, chlorine, bromine or iodine, hydrogen halide such as hydrogen fluoride, hydrogen chloride, hydrogen bromide or hydrogen iodide, sulfur halide compounds such as thionyl chloride, thionyl bromide or sulfuryl chloride, and phosphorus halide compounds such as phosphorus trichloride, phosphorus tribromide, ph
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