• For a procedure for conversion of carboxylic acids to primary amides by heating with urea, see: Org. Synth. Coll., 3, 768 (1955); 4, 513 (1963).
• Reacts with alcohols on prolonged heating to give alkyl carbamates; see, e.g.: Org. Synth. Coll., 1, 140 (1941).
• Widely used in diazotization reactions for the destruction of excess HNO2.
• For the one-pot conversion of carboxylic acids to nitriles, by heating with urea in the presence of 1.5-2.0 moles of sulfamic acid, see: Chimia, 25, 94 (1971).