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Reaction of diarylureas with alcohols and sulfuric acid provides a non-phosgene route to alkyl aryl carbamates: Chem. Ind. (London), 435 (1991). Further reaction with TMS chloride and triethylamine converts these to aryl isocyanates under mild conditions: Angew. Chem. Int. Ed., 7, 941 (1968)./n