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Low amounts of a dimeric-type urea derivative (5%) were isolated as a byproduct in the Curtius rearrangement. For the formation of ureas in these reactions, see Ninomiya, K.; Shioiri, T.; Yamada, S. Phosphorus in organic synthesis, VII: Diphenyl phosphorazidate (DPPA): A new convenient reagent for a modified Curtius reaction. Tetrahedron 1974, 30, 2151-2157.
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