Synthesis and Evaluation of New Ethyl 2, 3??Dihydro??3??oxoisothiazolo [5, 4??b] pyridine??2??alkanoate Derivatives as Potential Herbicides

…, A Canal, M Royuela, PM Aparicio??Tejo

Index: Gil; Zabalza; Navarro; Manu; Gonzalez; Merino; Canal; Royuela; Aparicio-Tejo Pesticide Science, 1997 , vol. 49, # 2 p. 148 - 156

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Abstract

Abstract Several ethyl 2, 3-dihydro-3-oxoisothiazolo [5, 4-b] pyridine-2-alkanoate derivatives were synthesized as herbicides. Only 5-methyl derivatives inhibited both hypocotyl and root growth in the lettuce (Lactuca sativa L.) seedling test at 100 mg litre-1. Only ethyl propionate and valerate derivatives showed significant inhibition at 0· 1 mg litre-1, whereas ethyl acetate or butyrate derivatives were inactive. Contrary to unoxidized derivatives, the ...