Music Therapy's Impact in Palliative Care| IAPCON2024| Dr. Tara Rajendran
Elucidation of flavonoids
1. GENERAL STRUCTURAL
ELUCIDATION OF
FLAVONOIDS
Presented By:
Praveen Parkali
M.Pharm
Dept. Pharmaceutical Chemistry
JSS College of Pharmacy, Mysore.
Presented To:
Dr. Jaishree
Dept. Pharmaceutical Chemistry
JSS College of Pharmacy, Mysore.
2. Flavonoids are Polyphenolic
compounds possessing 15
carbon atoms; two benzene
rings joined by a linear three
carbon chain.
They are also known as
Anthoxanthins.
They are wiedely
distributed as
yellow pigments in
plants.
3. ELUCIDATION OF FLAVONES
Molecular formulae: Using analytical Data
Nature of oxygen atom: The no. of OH group is estimated
by the usual methods => Flavone does not contain any–
OH group.
On fusion with alkali, flavones are degraded to a phenol
and aromatic acids. Ex:-
4. Flavones on boiling with KOH gives four different products.
KOH
o-
hydroxydibenzoylmethane
Flavone
5. Finally the structure proposed by degradation method is
proved by it synthesis.
i) Robinson’s method:
o-
hydroxydibenzoylmethan
e
7. ELUCIDATION OF FLAVONOLS
Same manner as that of flavone
The mol formula is C15H10O3
It contains one hydroxyl group as indicated by usual
methods.
On boil with ethanolic solution of KOH, Flavonol yields ,o-
Hydroxybenzoyl methanol and benzoic acid indicates that
Flavonol is 3-hydroxy flavone.