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Two-dimensional INADEQUATE 13C NMR studies of maleopimaric acid, the diels–alder adduct of levopimaric acid and maleic anhydride, and of abietic acid

✍ Scribed by C. Kruk; N. K. de Vries; G. van der Velden

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
385 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Two‐dimensional INADEQUATE ^13^C NMR was used to establish firmly the carbon‐carbon connectivities present in abietic acid and maleopimaric acid, i.e. the adduct of levopimaric acid and maleic anhydride. This information leads to unambiguous assignments for the 20 and 24 carbon resonances of abietic acid and maleopimaric acid, respectively. Proton‐carbon chemical shift correlation and NOE experiments further revealed the three‐dimensional structure of maleopimaric acid.

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## Abstract The ^1^H and ^13^C NMR spectra of an alternating ethene/maleic anhydride copolymer and the corresponding acid and sodium salt were reinvestigated with regard to the signals depending on the configuration of the succinyl unit. From these assignments a 85/15 ratio of __threo__‐and __eryth