In some cases, a base catalyst is used to facilitate the reaction. This is especially important when dealing with less reactive isocyanates or alcohols.
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N,N-dimethoxy-N'-(4-nitrophenyl)urea
10-benzyl-10H-phenothiazine-3-carbaldehyde
Dicyanomethyl-anion
4-(2-methylbenzylidene)-2-phenyloxazol-5-one
