9617. Tribufos

Nomenclature

CAS number: 78-48-8
Phosphorotrithioic acid S,S,S-tributyl ester; S,S,S-tributyl phosphorotrithioate; B-1776; Def (Bayer CropSci.).
C12H27OPS3; mol wt 314.51.
C 45.83%, H 8.65%, O 5.09%, P 9.85%, S 30.59%.

Description and references

Organophosphate defoliant used in preparation of cotton for harvesting. Preparative method: K. H. Rattenbury, J. R. Costello, US 2943107 (1960 to Chemagro). Prepn: D. Voigt et al., C. R. Hebd. Seances Acad. Sci. 260, 2210 (1965). Comprehensive description: D. MacDougall, Anal. Methods Pestic. Plant Growth Regul. Food Addit. 4, 89-93 (1964). Oxidative chemistry and toxicology: J. H. Hur et al., J. Agric. Food Chem. 40, 1703 (1992). GC determn in water and fish tissue: C. Habig et al., J. AOAC Int. 70, 103 (1987). Acute toxicity: T. B. Gaines, Toxicol. Appl. Pharmacol. 14, 515 (1969). Human exposure studies: W. Kilgore et al., Residue Rev. 91, 71 (1984). Soil dissipation study: T. L. Potter et al., J. Agric. Food Chem. 50, 3795 (2002).

Chemical structure

Properties

Colorless to pale yellow liquid, mp <25°. bp0.3 150°. bp4 166.5°. d204 1.0552. nD20 1.534. Sol in aliphatic, aromatic, and chlorinated hydrocarbon solvents; alcohols. LD50 in male, female rats (mg/kg): 233, 150 orally; 360, 168 dermally (Gaines).

Use

Defoliant.