NMR spectral assignment of 2α- and 3β-methylhopanes and evidence for boat conformation in D ring of 17α(H),21α(H)-hopanes

Geir Kildahl-Andersen, Hans Peter Nytoft, Jon Eigill Johansen

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

4 Citationer (Scopus)

Abstrakt

The full 1H and 13C NMR chemical shift assignment of 2α-methyl-17α(H),21β(H)-hopane is presented. This compound is formed in mature sediments from biogenic sources of 2β-methyl-17β(H),21β(H)-hopanoids, which include several cyanobacteria. In addition, full 1H and 13C NMR chemical shift data of all four 17,21 isomers of 3β-methylhopane have been assigned. The thermodynamically most stable 3β-configuration corresponds to that found in bacterial sources. The data presented here suggest minor corrections to the 13C chemical assignments reported earlier for 17α(H)-hopanes. Moreover, spectral evidence indicates an unexpected ring-D boat conformation of 17α(H),21α(H)-hopanes, which may serve to explain the steric strain reported for this isomer.
OriginalsprogEngelsk
Sider (fra-til)951-954
Antal sider4
TidsskriftMagnetic Resonance in Chemistry
Vol/bind48
Udgave nummer12
DOI
StatusUdgivet - dec. 2010

Programområde

  • Programområde 3: Energiressourcer

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