13C-NMR Studies of Marine Natural Products. A Further Investigation into the Spin-Lattice Relaxation Behavior of the Cembranoid Diterpene Sinularin
作者:
R.T. Gampe,
A.J. Weinheimer,
G.E. Martin,
期刊:
Spectroscopy Letters
(Taylor Available online 1982)
卷期:
Volume 15,
issue 1
页码: 47-55
ISSN:0038-7010
年代: 1982
DOI:10.1080/00387018208062646
出版商: Taylor & Francis Group
关键词: cembranoid diterpene;13C-nmr;spin-lattice relaxation;isotropic tumbling.
数据来源: Taylor
摘要:
The13C-nmr spin-lattice (T1) relaxation times for the cembranoid diterpene sinularin have been re-examined. Results of this study indicate that the solution conformation of the molecule, particularly in the region surrounding the δ-lactone is highly comparable to that observed in the crystal structure. This conclusion is in direct contrast to a previous study which invoked a different conformation for this region of the molecule to account for a disparity between the calculated and observed T1relaxation times for the non-protonated carbons.
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