An exceptionally ready interconversion of configurational isomers in atisine

Abstract
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.

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