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Flavones 
By :- Kakadiya dipesh
Defination 
• Flavones are yellow pigments which occur in 
plant kingdom either in the free state or as 
glycosides or assosiated with tannins. 
• These are also known as anthoxanthins
• Chemically , flavones are hydroxylated 
derivatives of 2-phenyl-4-chromone.
Properties of flavones 
1. Yellow solids. 
2. Soluble in water ,ethanol ,and dilute acid. 
3. Precipetted by Lead salt. 
4. With Ferric chloride , flavones gives dull 
green or red brown colour.
General methods for the elucidation 
of structure of flavones 
• From analytical data and molecular weight 
determination, the molecular formula of flavone has been 
found to be C15H10O2. 
• When acetylated, flavone does not yield any acetyl 
derivative, indicating the absence of any –OH group. 
•When fused with KOH, it yields phenol & benzoic acid.
•When flavone is boiled with alcoholic KOH solution, it 
yields a mixture of four compound, salicylic acid(II), 
acetophenone (III), o-hydroxyacetophenone (IV) and 
benzoic acid (v).
•The formation of above products could be explained by 
assuming the structure (I) as the correct structure of 
flavone.
• On reaction with alchoholic KOH , the pyrone ring of 
flavone are open to produce 
o-hydroxydibenzoylmethane (IA) which than 
undergoes scission in two different ways to yeilds 
two pairs of products.
Synthesis of flavone 
• Kostanecki’s synthesis :-
Robinson’s synthesis :-
•Modified claisen’s condensation :-
•Baker-Venkatraman Synnthsis :-
•Wheeler’s synthesis :-

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Flavones

  • 1. Flavones By :- Kakadiya dipesh
  • 2. Defination • Flavones are yellow pigments which occur in plant kingdom either in the free state or as glycosides or assosiated with tannins. • These are also known as anthoxanthins
  • 3. • Chemically , flavones are hydroxylated derivatives of 2-phenyl-4-chromone.
  • 4. Properties of flavones 1. Yellow solids. 2. Soluble in water ,ethanol ,and dilute acid. 3. Precipetted by Lead salt. 4. With Ferric chloride , flavones gives dull green or red brown colour.
  • 5. General methods for the elucidation of structure of flavones • From analytical data and molecular weight determination, the molecular formula of flavone has been found to be C15H10O2. • When acetylated, flavone does not yield any acetyl derivative, indicating the absence of any –OH group. •When fused with KOH, it yields phenol & benzoic acid.
  • 6. •When flavone is boiled with alcoholic KOH solution, it yields a mixture of four compound, salicylic acid(II), acetophenone (III), o-hydroxyacetophenone (IV) and benzoic acid (v).
  • 7. •The formation of above products could be explained by assuming the structure (I) as the correct structure of flavone.
  • 8. • On reaction with alchoholic KOH , the pyrone ring of flavone are open to produce o-hydroxydibenzoylmethane (IA) which than undergoes scission in two different ways to yeilds two pairs of products.
  • 9. Synthesis of flavone • Kostanecki’s synthesis :-