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13 C and 1 H NMR assignments for a series of dehydroabietic acid derivatives
Author(s) -
Gigante Bárbara,
Santos Lina,
MarceloCurto Maria João,
Ascenso José
Publication year - 1995
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260330416
Subject(s) - chemistry , dept , resin acid , carbon 13 nmr , ring (chemistry) , stereochemistry , chemical shift , nuclear magnetic resonance spectroscopy , proton , proton nmr , amine gas treating , organic chemistry , medicinal chemistry , physics , quantum mechanics
Reliable assignments were made for a series of nitro and amine C ring‐substituted dehydroabietic acid derivatives, the main resin acid present in disproportionated rosin and an important intermediate in the chemical industry. A combination of 1D and 2D NMR techniques, including HETCORR, COSY and DEPT experiments, was used. Quaternary carbon atoms, mainly aromatic substituted, require care owing to assignment difficulties that are based on calculated data and are confirmed by long‐range 1 H, 13 C NMR correlation with selective INEPT and the proton‐detected HMBC experiment.