Title: Picolinafen
CAS Registry Number: 137641-05-5
CAS Name: N-(4-Fluorophenyl)-6-[3-(trifluoromethyl)phenoxy]-2-pyridinecarboxamide
Additional Names: 4¢-fluoro-6-[(a,a,a-trifluoro-m-tolyl)oxy]picolinanilide
Manufacturers' Codes: AC-900001
Trademarks: Pico (BASF)
Molecular Formula: C19H12F4N2O2
Molecular Weight: 376.30
Percent Composition: C 60.64%, H 3.21%, F 20.19%, N 7.44%, O 8.50%
Literature References: Aryloxypicolinamide herbicide for use in barley and wheat. Inhibits phytoene desaturase, an enzyme involved in carotenoid biosynthesis. Prepn: C. J. Foster et al., EP 447004; eidem, US 5294597 (1991, 1994 both to Shell). Comprehensive description of properties and field trials: R. H. White et al., Brighton Crop Prot. Conf. - Weeds 1999, 47-52.
Properties: White to chalky-white, finely crystalline solid, mp 107.2-107.6°. Vapor pressure (20°): 1.66 ´ 10-7 Pa (est.). Log P (octanol/water): 5.36-5.43 (pH 5-9). Soly in water (20°): 3.8-4.7 ´ 10-5 g/l. LD50 in rats (mg/kg): >5000 orally; >4000 dermally. LC50 in rats (mg/l): >5.9 by inhalation. LC50 in rainbow trout (96 hr): 0.281 mg/l (White).
Melting point: mp 107.2-107.6°
Log P: Log P (octanol/water): 5.36-5.43 (pH 5-9)
Toxicity data: LD50 in rats (mg/kg): >5000 orally; >4000 dermally; LC50 in rats (mg/l): >5.9 by inhalation; LC50 in rainbow trout (96 hr): 0.281 mg/l (White)
Use: Herbicide.

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