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Dolbier HW Solutions 662 - 756 AMINO ACIDS PEPTIDES AND...

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This imine then undergoes decarboxylation. The anion that results from the decarboxylation step is then protonated. The product is shown as its diketo form but probably exists as an enol. Hydrolysis of the imine function gives an aldehyde and a compound having a free amino group. This amine then reacts with a second molecule of the triketo form of ninhydrin to give an imine. Proton abstraction from the neutral imine gives its conjugate base, which is a violet dye.
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