Tribufos
Title: Tribufos
CAS Registry Number: 78-48-8
CAS Name: Phosphorotrithioic acid S,S,S-tributyl ester
Additional Names: S,S,S-tributyl phosphorotrithioate
Manufacturers' Codes: B-1776
Trademarks: Def (Bayer CropSci.)
Molecular Formula: C12H27OPS3
Molecular Weight: 314.51
Percent Composition: C 45.83%, H 8.65%, O 5.09%, P 9.85%, S 30.59%
Literature 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).
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).
Melting point: mp <-25°
Boiling point: bp0.3 150°; bp4 166.5°
Index of refraction: nD20 1.534
Density: d204 1.0552
Toxicity data: LD50 in male, female rats (mg/kg): 233, 150 orally; 360, 168 dermally (Gaines)
Use: Defoliant.

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