O-etherification between glycerol and glycerol monooleate—demonstration of formation of diglycerol monooleate and triglycerol monooleate by fast atom bombardment-mass spectroscopy and 13C nuclear magnetic resonance

2000 ◽  
Vol 3 (2) ◽  
pp. 173-177 ◽  
Author(s):  
Valérie Eychenne ◽  
Laurent Debrauwer ◽  
Zéphirin Mouloungui
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Mass Spectroscopy ◽  
Fast Atom Bombardment ◽  
13C Nuclear Magnetic Resonance ◽  
Glycerol Monooleate ◽  
Nuclear Magnetic

New Terpenoids from the Roots of Melia azedarach

2002 ◽  
Vol 55 (4) ◽  
pp. 291 ◽  
Author(s):  
S. Faizi ◽  
A. Wasi ◽  
B. S. Siddiqui ◽  
A. Naz
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Mass Spectroscopy ◽  
Melia Azedarach ◽  
Spectroscopic Methods ◽  
Two Dimensional ◽  
Root Extracts ◽  
13C Nuclear Magnetic Resonance ◽  
Rare Class ◽  
Nuclear Magnetic

Two new terpenoids, bakayanolide (1) and 2α-hydroxy-3β-methoxy-6-oxo-13α,14β,17α-lanosta-7,24-dien-21,16β-olide (2), together with the known compounds 6β-hydroxy-3-oxo-13α,14β,17α-lanosta-7,24-dien-21,16β-olide (3), sendanolactone (4), kulactone (5), and β-sitosterol have been isolated from the ethanolic root extracts of Melia azedarach. Triterpenoids (4), (5), and β-sitosterol have been identified previously from M. azedarach, while it is the first instance of the isolation of (3) from this source. The identity of these compounds was established through extensive spectroscopic methods (infrared and mass spectroscopy, 1H and 13C nuclear magnetic resonance) as well as appropriate two-dimensional nuclear magnetic resonance experiments. Bakayanolide (1) belongs to the rare class of C11 odd terpenes. Compounds (3) and (4) possessed moderate cytotoxic activity against KB cell lines.

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