Chrysanthemic and pyrethric acids

The Chrysanthemum Extract comprise of a mixture oiester e.g., chrysanthemic and pyrethric acids alcohols e.g., cinerolone and pyrethrolone. As the esters are usually more prone to get hydrolyzed and oxidized, hence it must be stored in sealed light-proof containers in a cool place. 

Chrysanthemol from the leaves of Artemisia ludiviciana (Asteraceae) belongs to the cyclopropane monoterpenes Cinerins, jasmolins and pyrethrins (all including derivatives 1 and 11) are esters of /rara-chrysanthemic and pyrethric acid with terpenoid hydroxypentenones such as cinerolone, jasmolone and pyrethrolone. These are the active insecticidal constituents of pyrethrum recovered from dried flowers of several Chrysanthemum species (e.g. Chrysanthemum cinerariaefolium, Asteraceae). Some synthetic esters of chrysanthemic acid are also applied as insecticides. 

Figure 3.15 Proposed mechanism for the biosynthesis of chrysanthemic and pyrethric acids.

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