Title: Pyrithiobac
CAS Registry Number: 123342-93-8
CAS Name: 2-Chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio]benzoic acid
Manufacturers' Codes: KIH-8921
Molecular Formula: C13H11ClN2O4S
Molecular Weight: 326.76
Percent Composition: C 47.78%, H 3.39%, Cl 10.85%, N 8.57%, O 19.59%, S 9.81%
Literature References: Pyrimidinylsalicylic acid herbicide for use in cotton; acetolactate synthase inhibitor. Prepn: Y. Saito et al., EP 315889; eidem, US 4923501 (1989, 1990 both to Kumiai Chem. Ind.; Ihara Chem. Ind.). Field trials in cotton: J. W. Keeling et al. Weed Technol. 7, 930 (1993). Mechanism of action: T. Shimizu et al., J. Pestic. Sci. 19, 59 (1994). Comprehensive description: S. Takahashi et al., Brighton Crop Prot. Conf. - Weeds 1991, 57-62.
Properties: Ochre powder, mp 148-151°.
Melting point: mp 148-151°
Derivative Type: Sodium salt
CAS Registry Number: 123343-16-8
Manufacturers' Codes: KIH-2031; DPX-PE350
Trademarks: Staple (DuPont)
Molecular Formula: C13H10ClN2NaO4S
Molecular Weight: 348.74
Percent Composition: C 44.77%, H 2.89%, Cl 10.17%, N 8.03%, Na 6.59%, O 18.35%, S 9.19%
Properties: White solid, mp 247.7° (dec). Soly in water (10°): 760 g/l. LD50 in male, female rats (mg/kg): 1000-3000, 3000-5000 orally. LD50 in rats (mg/kg): >2000 dermally (Takahashi).
Melting point: mp 247.7° (dec)
Toxicity data: LD50 in male, female rats (mg/kg): 1000-3000, 3000-5000 orally; LD50 in rats (mg/kg): >2000 dermally (Takahashi)
Use: Herbicide.

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