Indigo di- and monoimines can be protonated to form stable salts in which the central C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
C bond has isomerized from a trans to cis configuration. Deprotonation of these salts regenerates the neutral trans species. The protonation chemistry of indigo is also explored.
E. C. Nicholls-Allison, G. Nawn, B. O. Patrick and R. G. Hicks, Chem. Commun., 2015, 51, 12482 DOI: 10.1039/C5CC04492H
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