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    • A practical amine-free synthesis of symmetric ureas and thioureas by self-condensation if iso(thio)cyanates 

      Jiménez Blanco, José L.; Saitz Barría, Claudio; Benito, Juan M.; Ortíz Mellet, Carmen; Fuentes, José; Santoyo González, Francisco; García Fernández, José M. (Thieme Stuttgart, 1999)
      Isocianates and isothiocyanates are readily transformed into the corresponding symmetric N,N'-disubstituted ureas and thioureas upon treatment with pyridine-water with no formation of side products. Evidence is shown for ...