ISSN:
0749-1581
Keywords:
Oligostilbene
;
Hopeaphenol
;
Carex pumila
;
C2 symmetric molecule
;
Isotopomeric asymmetry
;
2D NMR INEPT-LSPD
;
Modified COLOC
;
HMBC
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
In the structure determination of the C2 symmetrical tetrastilbene hopeaphenol, isolated from Carex pumila, the elucidation of the C--C connectivity between equivalent carbons was needed. From an isotopomeric point of view, three isotopomers, 12C—12C, 12C—13C and 13C—13C, are present with respect to the equivalent carbons connecting each other. Among them, the the 12C—12C species is undetectable and the 13C—13C species is excluded owing to its low natural abundance. Therefore, only the 12C—13C isotopomer is detected in 13C NMR and this species is not symmetrical. In the H—12C—13—H system, the separate detection of 1J(CH) and 2J(CH) was achieved by the INEPT-LSPD, COLOC and HMBC methods to demonstrate the connectivity between the equivalent carbons from the viewpoint of isotopomeric asymmetry.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260300103
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