NEW MATERIAL:The compound of formula I [X and Y are halogen; R is H, 1W3C lower alkyl, alkyl substituted with halogen or lower alkoxy, acetyl, methoxyacetyl or CON(CH3)Or (r is 1W3C lower alkyl), n is 0W2; m is 1 or 2].
EXAMPLE: 1-Methyl-4-(2-chlorophenyl)pyrazole.
USE: Fungicide for agricultural and horticultural use. It has especially excellent cotrolling effect against gray mold and sclerotinia rot of vegetables, scab of apple, and downy mildew of cucumber.
PROCESS: A compound of formula I wherein n is 0 and R is lower alkyl can be prepared by reacting the 2-phenylmalondialdehyde of formula II with hydrazine of formula III in a solvent. The compound can be converted to another compound of formula I wherein n is 1 or 2 and R is lower alkyl by reacting with a halogenation agent such as N-chlorosuccinimide.
HASHIMOTO AKIRA
NISHIKAWA HIROAKI
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