prov:value
| - Soc. 89, 1967, pages 5461-5462), by reaction either in the presence of an isocyanate, such as phenyl isocyanate, and an organic base, such as, for example, triethylamine, in a hydrocarbon, for example benzene or toluene, at temperatures from 0??? C. to the boiling point of the reaction mixture, or under the influence of an inorganic acid halide, for example phosphorus oxychloride, in a halogenated
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