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Publication

Two dolabrane-type diterpenoids

Title
Two dolabrane-type diterpenoids
Type
Article in International Scientific Journal
Year
1997
Authors
damas, am
(Author)
Other
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kijjoa, a
(Author)
ICBAS
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pinto, m
(Author)
FFUP
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Journal
Vol. 53
Pages: 755-757
ISSN: 0108-2701
Publisher: Blackwell
Other information
Authenticus ID: P-001-B7X
Abstract (EN): The crystal structures of two dolabrane diterpenes, ent-2-seco-3-nor-5 alpha,4,15-dioxo-16-hydroxydolabran-2-oic acid, C19H30O5, (I), and ent-2-seco-3-nor-5 alpha,16-chloro-15-hydroxydolabran-2-oic acid, C(19)H(31)C(10)4, (II), have been determined at room temperature. They revealed the presence of two trans-fused rings having a chair conformation and they confirmed previous NMR studies showing that the C9 substituent is trans with respect to those at C8 and C10. Furthermore, we observed that the longer C-Sp3-C-sp3 distances occur for C9-C10 and C5-C10, which is in agreement with the values found in other diterpenes. These are the first reported crystal structures of dolabrane molecules.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 3
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