8757. Spirodiclofen

Nomenclature

CAS number: 148477-71-8
2,2-Dimethylbutanoic acid 3-(2,4-dichlorophenyl)-2-oxo-1-oxaspiro[4,5]dec-3-en-4-yl ester; BAJ2740; Envidor (Bayer).
C21H24Cl2O4; mol wt 411.32.
C 61.32%, H 5.88%, Cl 17.24%, O 15.56%.

Description and references

Tetronic acid acaricide for use in fruit, grapevines and nuts. Prepn: R. Fischer et al., DE 4216814; eidem, US 5262383 (both 1993 to Bayer). Comprehensive description of properties and activity: U. Wachendorff et al., BCPC Conf. - Pests Dis. 2000, 53. Greenhouse trials vs spider mites: R. Nauen et al., ibid. 453.

Chemical structure

Properties

White powder, mp 101-108°. Log P (n-octanol/water): 5.8 (pH 4 at 20°). Vapor pressure (20°): 3 × 107 Pa. Soly in water (pH 4): 50 μg/l at 20°. LD50 in rats (mg/kg): >2500 orally; >2000 dermally (24 hr). LC50 (4 hr) in rats (mg/m3): >5000 by inhalation; LC50 (96 hr) in fish: >68 mg/l (Wachendorff).

Use

Acaricide.