3996. Fenpyroximate

Nomenclature

CAS number: 134098-61-6
4-[[[(E)-[(1,3-Dimethyl-5-phenoxy-1H-pyrazol-4-yl)methylene]amino]oxy]methyl]benzoic acid 1,1-dimethylethyl ester; tert-butyl (E)-α-(1,3-dimethyl-5-phenoxypyrazol-4-ylmethyleneaminooxy)-p-toluate; NNI-850; HOE-555-02A; Sequel (Nihon).
C24H27N3O4; mol wt 421.49.
C 68.39%, H 6.46%, N 9.97%, O 15.18%.

Description and references

Phenoxypyrazole based acaricide. Chemical, biological properties and field evaluation: T. Konno et al., Proc. Br. Crop Prot. Conf. - Pests Dis. 1990, 71. Mode of action: K. Motoba et al., Pestic. Biochem. Physiol. 43, 37 (1992). Control of spider mites: M. Van de Veire, D. Degheele, Meded. Fac. Landbouwwet. Univ. Gent 57, 925 (1992). Metabolism in rats: H. Nishizawa et al., J. Pestic. Sci. 18, 59 (1993). Soil degradation: Y. Izawa et al., ibid. 67.

Chemical structure

Properties

White crystalline powder, mp 101.1-102.4°. Vapor pressure at 25°: 5.6 × 108 mm Hg. Soly at 20° (g/l): water 0.015 × 103; at 25°: methanol 15; n-hexane 4; xylene 175. Log P (octanol/water) at 20°: 5.01. LD50 in male, female rats (mg/kg): 480, 245 orally; >2000, >2000 dermally. LC50 (48hr) in carp: 6.1 μg/l; LC50 (3hr) in Daphnia pulex: 85 μg/l (Konno).

Use

Acaricide.