The elusive E-isomer of aldonitrones was formed in two independent kinetically controlled reactions; the observation of both the E- and the Z-aldonitrones at equilibrium, and their subsequent separation, permitted an estimation of rotational barriers by direct thermal stereomutation.
J. Bjørgo, D. R. Boyd and D. C. Neill, J. Chem. Soc., Chem. Commun., 1974, 478 DOI: 10.1039/C39740000478
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