| http://www.w3.org/ns/prov#value | - Next, a compound (VII) in which X is a halogen atom can be produced by allowing a suitable halogenation agent (for example, phosphorus oxychloride, phosphorus oxybromide, phosphorus trichloride, phosphorus tribromide, carbon tetrachloride-triphenylphosphine, carbon tetrabromide-triphenylphosphine, N-chlorosuccinimide-triphenylphosphine, N-bromosuccinimide-triphenylphosphine, iodine-triphenylphosph
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