The study of the n.m.r. spectrum of (+)-coyhaiquine (1), the first known oxidized proaporphine–benzylisoquinoline, has led to a simple method for the assignment of stereochemistry at C-13 for the proaporphines.
V. Fajardo, H. Guinaudeau, V. Elango and M. Shamma, J. Chem. Soc., Chem. Commun., 1982, 1350 DOI: 10.1039/C39820001350
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