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Chlorothalonil

NOMENCLATURE

Common name chlorothalonil (BSI, E-ISO, (m) F-ISO, ANSI); TPN (JMAF)

IUPAC name tetrachloroisophthalonitrile 

Chemical Abstracts name 2,4,5,6-tetrachloro-1,3-benzenedicarbonitrile 

CAS RN [1897-45-6]  EEC no. 217-588-1  Development codes DS-2787 (Diamond Shamrock)  

PHYSICAL CHEMISTRY

Composition Tech. is c. 97%.  Mol. wt. 265.9  M.f. C8Cl4N2  Form Colourless, odourless crystals; (tech. has a slightly pungent odour).  M.p. 252.1 ℃  B.p. 350 ℃/760 mmHg  V.p. 0.076 mPa (25 ℃)  KOW logP = 2.92 (25 ℃)  Henry 2.50 *10-2 Pa m3 mol-1 (25 ℃)  S.g./density 2.0 (20 ℃)  Solubility In water 0.81 mg/l (25 ℃). In xylene 80, cyclohexanone, dimethylformamide 30, acetone, dimethyl sulfoxide 20, kerosene <10 (all in g/kg, 25 ℃).  Stability Thermally stable at ambient temperatures. Stable to u.v. light in aqueous media and in crystalline state. Stable in acidic and moderately alkaline aqueous solutions; slow hydrolysis at pH >9.