prov:value
| - Reaction of diamine 16 with a carbonyl equivalent 17 (for example, phosgene, carbonyldiimidazole and the like wherein Q??? and Q??? are leaving groups such as Cl, Br, I, ???O-loweralkyl, ???O-aryl or imidazolyl and the like) in an inert solvent (for example, THF, dimethoxyethane, methyl t-butyl ether, toluene or heptane and the like) in the presence of a base (for example, NaH or potassium t-butox
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