Abstract:
The new compound as 5-(2H-1-benzopyran-6-yl)-2-[1-(ethoxylimino) butyryl -3-hydroxy cyclohex-2-en-1-one (I) is prepared by (1) reacting 4-hydroxy benzaldehyde and 4-propazyl halide to get 4-propazyl 2H- 1- benzypyran-6- carboxaldehyde (II), (2) reacting (II) in alkali to get 4- (2H-1-benzopyran -6-y l0-3-buten-2-one (III), (3) reacting (III) with diethyl malonate to get 5-(2H-1-benzopyran-6-yl)- cyclohexan-1,3-dione (IV), (4) reacting (IV) with butyrate to get 2-butyryl-5-(2H-1-benzopyran-6-yl) -3-hydroxy cyclohex-2-en-1-one (V), reacting (V) with ethoxyl amine and sodium acetate to get (I). (I) as herbicide is useful for soybean, cotton, sugarbeet, sunflower, strawberry, wheat, corn and rice.
Abstract:
The derivative of formula (I) is useful for herbicides or plant growth regulants. In (I), X is H, 1-6c alkyl, 2-6c alkoxy, halogen, 1-6c haloalkyl, NO2, CN, 1-6c alkylthio, 1-6c alkylsulphinyl, 1-6c alkylsulphonyl, sulphamoyl, N-(1-6c alkyl) sulphamoyl or N,N-di(1-6c alkyl) sulphamoyl; R1 is H or 1-4c alkyl; R2 is 1-6c alkyl, 2-6c alkenyl or 2-6c alkynyl; R3 is H, 1-6c alkyl, 1-6c haloalkyl, 2-6c alkenyl, 2-6c haloalkenyl, 2-6c alkoxyalkyl, 2-6c alkylthioakyl, benzyl or 2-6c haloalkanoyl; R4 is H, alkali metal cation, alkaline earth metal cation, 1-4c alkanoyl, 1-4c haloalkanoyl or benzoyl.