Title: Diphacinone
CAS Registry Number: 82-66-6
CAS Name: 2-(Diphenylacetyl)-1H-indene-1,3(2H)-dione
Additional Names: 2-diphenylacetyl-1,3-diketohydrindene; 2-diphenylacetyl-1,3-indandione; diphenadione
Manufacturers' Codes: U-1363
Trademarks: Diphacin (Hacco); Ditrac (Bell); Ramik (Hacco)
Molecular Formula: C23H16O3
Molecular Weight: 340.37
Percent Composition: C 81.16%, H 4.74%, O 14.10%
Literature References: Anticoagulant; inhibits vitamin K-dependent synthesis of factors II, VII and X. Prepn: D. G. Thomas, US 2672483 (1954 to Upjohn). Anticoagulant effects in rodents: J. T. Correll et al., Proc. Soc. Exp. Biol. Med. 80, 139 (1952). Metabolism in rats and mice: C. C. Yu et al., Drug Metab. Dispos. 10, 645 (1982). LC/MS determn in commercial rodenticides: M. Z. Mesmer, R. A. Flurer, J. Chromatogr. A 891, 249 (2000).
Properties: Pale yellow crystals from ethanol, mp 146-147°. Practically insol in water. Slightly sol in benzene, hot ethanol. Sol in acetone, acetic acid. LD50 orally (mg/kg): 3 in rats; 340 in mice; 35 in rabbits (Correll).
Melting point: mp 146-147°
Toxicity data: LD50 orally (mg/kg): 3 in rats; 340 in mice; 35 in rabbits (Correll)
Use: Rodenticide.

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