Atisine in solution is shown to contain a 2:1 mixture of two isomeric species whose rate of interconversion is fast on the n.m.r. time scale in polar hydrogen-bonding solvents, but relatively slow in solvents which would not stabilize an ionic species, leading to the suggestion that it is a mixture of configurational isomers interconvertible via a zwitterion.
S. K. Pradhan and V. M. Girijavallabhan, J. Chem. Soc. D, 1970, 644 DOI: 10.1039/C29700000644
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