- Pyrazol-4-yl phosphites
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A 4-pyrazolyl phosphorous acid ester of the following formula, STR1 (R is a lower alkyl group; Y is a phenyl group which may optionally be substituted by a halogen, halogens, a lower alkyl group or a halogen and a lower alkyl group.) which is produced by reacting corresponding 4-hydroxylpyrazole compound with a trialkyl phosphite. The ester gives 4-pyrazolyl phosphorothioate by the reaction with an alkylsulfenyl halide.
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- Pyrazol-4-yl phosphates and insecticidal and acaricidal use
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Pyrazol-4-yl phosphates of the formula STR1 wherein R1 represents a lower alkyl group, R2 is a lower alkoxy group or a lower alkylthio group, R3 represents hydrogen or a lower alkoxycarbonyl group, X is oxygen or sulfur atom, Y represents a lower alkyl, a lower alkoxy or a lower alkylthio group, a halogen atom, nitro or trifluoromethyl, and n is zero or an integer of 1, 2 or 3, or Yn represents an alkylidenedioxy containing 1 to 3 carbon atoms, have marked insecticidal-acaricidal activity against household pests, plant pests, mites, etc. without substantial toxicity to warm-blooded animals and fishes.
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