Acid base isomerization
Many lignans, due to the existence of stereoisomerism in the saturated ring structure, are prone to Flax lignans and form isomers after acid-base interaction. In addition, dicyclohexyllignans often have symmetrical structures. Under the action of acid, the bond between the oxygen atom and the benzyl carbon atom on the furan ring is easy to crack, and the configuration changes when it is closed again. Some lignans can also cause structural rearrangement when they encounter mineral acid. [Sweet Potato Powder] [specific example 2]
Functional group reaction
Plant Extract Lignans often have alcohol hydroxyl, phenolic hydroxyl, methoxy, methylene dioxy, carboxyl and lactone groups, so they also have the properties and reactions of these functional groups. Ferric chloride or diazotization reagent can be used for the detection of phenolic hydroxyl group, Labat reagent (Capsicum Oleoresin concentrated sulfuric acid reagent) or ecgrine reagent (chromotropic acid concentrated sulfuric acid reagent) can be used for the detection of methylene dioxy.
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