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 alongwiith dehydrated parthenin.Cyclopropyl analogue has been found to be most effective against Phaseolus aureus when compared to parthenin.
Saxena, D B,Dureja, P,Kumar, B,Rani, Daizy,Kohli, R K
p. 849 - 852
(2007/10/02)
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