Pyridaben
Title: Pyridaben
CAS Registry Number: 96489-71-3
CAS Name: 4-Chloro-2-(1,1-dimethylethyl)-5-[[[4-(1,1-dimethylethyl)phenyl]methyl]thio]-3(2H)-pyridazinone
Additional Names: 2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one
Manufacturers' Codes: NC-129; NCI-129
Trademarks: Sanmite (Nissan); Nexter (BASF)
Molecular Formula: C19H25ClN2OS
Molecular Weight: 364.93
Percent Composition: C 62.53%, H 6.91%, Cl 9.72%, N 7.68%, O 4.38%, S 8.79%
Literature References: Pyridazinone derivative. Prepn: JP Kokai 85 4173; M. Taniguchi et al., US 4877787 (1985, 1989 both to Nissan). Chemical and biological properties: K. Hirata et al., Brighton Crop Prot. Conf. - Pests Dis. 1988, 41; K. Hirata et al., J. Pestic. Sci. 20, 177 (1995). HPLC determn in soil: C. Y. Deng et al., Fenxi Huaxue 23, 1357 (1995); C.A. 124, 7749 (1995). Field trials against mites: G. Sterk, C. Versmissen, Meded. Fac. Landbouwwet. Univ. Gent 57, 941 (1992). Review of field trials: G. Sterk, Brighton Crop Prot. Conf. - Pests Dis. 1994, 559-568.
Properties: Odorless, white crystalline solid, mp 111-112°. d420: 1.2. Vapor pressure (20°): 1.9 ´ 10-6 mm Hg. Soly at 20° (g/100ml): acetone 46, corn oil 4.2, ethanol 5.7, methyl cellosolve 11, xylene 39, benzene 11, cyclohexane 32, hexane 1.0, n-octanol 6.3, water 1.2 ´ 10-6. Stable in water at pH 4, 7, 9. Stable in most organic solvents. Stable to heat at 50° for 3 months. LD50 in male, female rats, bobwhite quail, mallard ducks (mg/kg): 435, 358, >2250, >2500 orally (Hirata). LD50 in male, female rabbits (mg/kg): >2000, >2000 dermally (Hirata).
Melting point: mp 111-112°
Toxicity data: LD50 in male, female rats, bobwhite quail, mallard ducks (mg/kg): 435, 358, >2250, >2500 orally (Hirata); LD50 in male, female rabbits (mg/kg): >2000, >2000 dermally (Hirata)
Use: Acaricide.

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