The mass spectra of aporphine alkaloids oxygenated at the 1- and 11-positions show marked differences from the spectra of other aporphines. These differences are attributed to the steric hindrance to coplanarity of the biphenyl ring system caused by the 1- and 11-substituents, and this factor may be of use in structural studies.
A. H. Jackson and J. A. Martin, J. Chem. Soc. C, 1966, 2181 DOI: 10.1039/J39660002181
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