Tropical Marine Algae. II. The Structure Determination of New Halogenated Monoterpenes From Plocamium hamatum (Rhodophyta, Gigartinales, Plocamiaceae)

1988 ◽  
Vol 41 (11) ◽  
pp. 1743 ◽  
Author(s):  
JC Coll ◽  
BW Skelton ◽  
AH White ◽  
AD Wright
Keyword(s):  
Marine Algae ◽  
Two Dimensional ◽  
X Ray ◽  
X Ray Crystallography ◽  
Halogenated Monoterpenes ◽  
Relative Stereochemistry ◽  
Structure Determinations ◽  
Absolute Stereochemistry ◽  
Related Metabolite

The structure determinations of new halogenated monoterpenes, isolated from collections of Plocamium hamatum J. Agardh , are reported. One collection of P. hamatum afforded (1R*,2R*,4S*,5R*,1′E)-1,2,4- trichloro-5-(2′-chloroethenyl)-1,5-dimethylcyclohexane (1) whose relative stereochemistry was determined by X-ray crystallography. Extensive use of two-dimensional carbon-hydrogen correlation experiments enabled unambiguous assignments of proton and carbon resonances to be made for this new compound. Complete carbon assignments for the related metabolite mertensene (2) are reported. A second collection of P. hamatum afforded three new halogenated monoterpenes. The relative and absolute stereochemistry of (2S,3E,5S,6S,7S)-1,5,7-tribromo-2,6,8-trichloro-2,6-dimethyloct-3-ene (3) was determined by n.m.r . and X-ray crystallography, while for (3R*,4S*,5E)-4,8-dibromo-3,7-dichloro-3,7-dimethylocta-1,5-diene (4) and (2R*,4S*,5R*,1*E)-4-bromo-2-chloro-5-(2′-chloroethenyl)-5-methyl-1-methylenecyclohexane (5), the structures and relative configurations were determined by n.m.r . spectroscopy.

Studies of Australian Soft Corals .XXXVII. The Structure Determination of 2 Cembranolide Diterpenes From Soft Corals of the Genus Efflatounaria (Coelenterata, Octocorallia, Alcyonacea)

1986 ◽  
Vol 39 (1) ◽  
pp. 123 ◽  
Author(s):  
BF Bowden ◽  
JC Coll ◽  
LM Engelhardt ◽  
GV Meehan ◽  
GG Pegg ◽  
...  
Keyword(s):  
Structure Determination ◽  
Soft Coral ◽  
Soft Corals ◽  
X Ray ◽  
X Ray Crystallography ◽  
Coral Genus ◽  
Relative Stereochemistry ◽  
Chemical Correlation ◽  
Absolute Stereochemistry

Two isomeric 7,8-epoxycembra-3,11,15-trien-16,2-olides have been isolated from different species of the soft coral genus Efflatounaria. The structure of each was deduced spectroscopically , and the relative stereochemistry of one was determined by X-ray crystallography. The absolute stereochemistry of each cembranolide was obtained by chemical correlation with known compounds.

Synthesis and Structural Characterization of a New Two-Dimensional Polymeric Thallium(I) Complex, [Tl2(phthalate)]n

2005 ◽  
Vol 60 (7) ◽  
pp. 741-744 ◽  
Author(s):  
M. R. Fadaei ◽  
A. Morsali ◽  
Ali R. Mahjoub
Keyword(s):  
Coordination Polymer ◽  
Structural Characterization ◽  
Two Dimensional ◽  
X Ray ◽  
X Ray Crystallography

Determination of the structure of the [Tl2(phthalate)] by X-ray crystallography shows that there are six (TlO6) and five (TlO5) coordinate Tl atoms. The complex is a two-dimensional coordination polymer.

Studies of Australian Soft Corals. XLI. Structure Determination of a New Sesquiterpene From Xenia novae-britanniae and an Investigation of a Xenia Species

1987 ◽  
Vol 40 (8) ◽  
pp. 1483 ◽  
Author(s):  
BF Bowden ◽  
JC Coll ◽  
LM Engelhardt ◽  
A Heaton ◽  
AH White
Keyword(s):  
Single Crystal ◽  
Structure Determination ◽  
Soft Coral ◽  
Soft Corals ◽  
X Ray ◽  
X Ray Crystallography ◽  
Relative Stereochemistry

.A novel sesquiterpene (1 Z,2R*,4R*,7S*,11S*)-3,3,7,11-tetramethyltricyclo[6.3.0.02,4]undec-1(8)-en-4-ol (3) was isolated from the soft coral Xenia novae-britanniae. Its structure was tentatively deduced by n.m.r. spectroscopy, and the structure with relative stereochemistry was confirmed by single-crystal X-ray crystallography. Investigation of a Xenia species afforded the known metabolite waixenicin -A previously isolated from Anthelia edmondsoni .

Resolution of Thiele’s acid

2017 ◽  
Vol 95 (3) ◽  
pp. 234-238 ◽  
Author(s):  
Jun Chen ◽  
XuXin Sun ◽  
Allen G. Oliver ◽  
Jeremy E. Wulff
Keyword(s):  
Salt Formation ◽  
Diverse Range ◽  
X Ray ◽  
X Ray Crystallography ◽  
First Time ◽  
Molecular Clefts ◽  
Absolute Stereochemistry

Thiele’s acid has been resolved for the first time by diastereomeric salt formation with brucine. Determination of absolute stereochemistry was accomplished by X-ray crystallography of the corresponding diester. We anticipate that access to optically resolved Thiele’s acid will stimulate its use in a diverse range of applications requiring chiral molecular clefts.

Synthesis of enantiopure 2-aryl-2-methoxypropionic acids and determination of their absolute configurations by X-ray crystallography

Chirality ◽  
2008 ◽  
Vol 20 (3-4) ◽  
pp. 251-264 ◽  
Author(s):  
Satoshi Sekiguchi ◽  
Junpei Naito ◽  
Hiromi Taji ◽  
Yusuke Kasai ◽  
Akinori Sugio ◽  
...  
Keyword(s):  
X Ray ◽  
X Ray Crystallography
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