It has been known for many years that amines will react with urea to form substituted ureas. Davis and colleagues2 have pointed out that this reaction involves a'dearrangement" of urea, whereby isocyanic acid is formed and then reacts with an amine to form a monosubstituted urea. The monosubstituted urea may itself dearrange to an isocyanate; this, upon reaction with more amine, forms a disubstituted urea. Olin3 has described the ...
