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Bioefficacy evaluation of novel N-alkyl-2-hydroxyketimines (schiff bases)

Indian Agricultural Research Journals

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Title Bioefficacy evaluation of novel N-alkyl-2-hydroxyketimines (schiff bases)
 
Creator SHAKIL, NAJAM AKHTAR
USHARANI, PATHIPATI
KUMAR, JITENDRA
SINGH, MANISH KUMAR
PANDEY, ALKA
KUNDU, ADITI
AHLUWALIA, VIVEK
 
Subject Achaea janata; Antifeedant; Environmentally benign; Microwave; Schiff’s bases; Spodoptera litura
 
Description Twelve new ortho-Hydroxyketimines were synthesized during 2006–07 by conventional as well as microwave method and evaluated for their antifeedant activity against the lepidopteran insect pests, Acheae janata (L.) and Spodoptera litura (L.). Conventional methods for synthesis of Schiff bases require refluxing at 140° C of the reactants in different solvents for at least 24 hr or more, whereas the microwave-assisted synthesis has brought down the reaction time from 24 hr to 1 min. The procedure does not require any organic solvents and the time has been reduced to only 1 min. Comparative yields of all compounds by different methods revealed that the yield was low in conventional method (79– 87%) as compared to microwave-assisted synthesis (94–97%). The bioassay revealed that all the test compounds exhibited promising insect antifeedant activity; N-hexyl-2-hydroxyacetophenonimine being the most effective with antifeedant index value of 100, followed by N-hexyl-2-hydroxypropiophenonimine with antifeedant index value of 81.32 against A. janata and antifeedant index value of 100 of N-hexyl-2-hydroxypropiophenonimine against S. litura. The results obtained from bioassay indicated that this class of compounds has not only given a lead with regard to potential of Schiff bases in pest control, but has suggested that a carbon chain length of 6 atoms in the atoms in the side chain is optimum on the basis of structure activity relationship (SAR).
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor ICAR
 
Date 2011-01-04
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/2488
 
Source The Indian Journal of Agricultural Sciences; Vol 79, No 9 (2009)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/2488/622
 
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