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The proton magnetic resonance spectra of protoberberinium salts

1972; Royal Society of Chemistry; Issue: 10 Linguagem: Inglês

10.1039/p29720001393

2050-8239

K. Jewers, A.H. Manchanda, P. N. Jenkins,

Plant-based Medicinal Research

The 1H n.m.r. spectra of a number of synthetic and naturally occurring protoberberinium salts have revealed several useful correlations between the chemical shifts of alkoxy and aromatic protons and the chemical structures of these molecules. The application of these correlations for the prediction of structures of new alkaloids of this group is discussed and the constitution of groenlandicine is revised.