The nitrilimine-alkene cycloaddition is an ultra rapid click reaction.
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abstract
The transient formation of nitrilimine in aqueous conditions is greatly influenced by pH and chloride. In basic conditions (pH 10) with no chloride, a diarylnitrilimine precursor readily ionizes to form diarylnitrilimine that reacts almost instantly with an acrylamide-containing protein and fluorescently labels it.