2.4.4 Chalcone Glycosides
Chalcones are characterised usually by the presence of the following essential structure:
Ar(A) —CO—CH = CH—Ar(B)
Evidently, the two aromatic rings (A and B) are linked by the three carbon -aliphatic chain which does not actively take part in the formation of a hetero-ring as is normally found in other types of flavonoid compounds. Likewise, the dihyrochalones shall have the following general structure:
Ar(A) —CO—CH2—CH2—Ar(B)
Also, the chalone yields a flavanone on treating with 10% H2SO4. These two reactions may be represented as follows:
Interestingly, the chalones and flavanones are closely related to each other and they are also fully interconvertible.
Examples:
