Modification of parthenin

Saxena, D. B. ; Dureja, P. ; Kumar, B. ; Rani, Daizy ; Kohli, R. K. (1991) Modification of parthenin Indian Journal of Chemistry - Section B: Organic and Medicinal Chemistry, 30 . pp. 849-852. ISSN 0376-4699

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Parthenin, the principal chemical constituent of Parthenium hysterophorus weed has been transformed chemically and photochemically with a view to study the structure-activity relationship for allelopathic effects. Chemical transformation gives three products replacing the exocyclic methylene double bond of the lactone ring by a pyrazoline nucleus, a cyclopropane ring and a propenyl group. Photochemical reaction leads to the formation of a hemiacetal and a lactone in place of the cyclopentenone moiety alongwith dehydrated parthenin. Cyclopropyl analogue has been found to be most eifective against Phaseolus aureus when compared to parthenin.

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