Monocron

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NOMENCLATURE
Common name monocrotophos (BSI, E-ISO, (m) F-ISO, ESA, JMAF)
IUPAC name dimethyl (E)-1-methyl-2-(methylcarbamoyl)vinyl phosphate; 3-dimethoxyphosphinoyloxy-N-methylisocrotonamide
Chemical Abstracts name (E)-dimethyl 1-methyl-3-(methylamino)-3-oxo-1-propenyl phosphate
CAS RN [6923-22-4] (formerly [919-44-8]) monocrotophos; [919-44-8] (Z)- analogue; [2157-98-4] (E)- + (Z)- compounds EEC no. 230-042-7 Development codes C 1414 (Ciba); SD 9129 (Shell) Official codes OMS 834; ENT 27 129

PHYSICAL CHEMISTRY
Mol. wt. 223.2 M.f. C7H14NO5P Form Colourless, hygroscopic crystals; (tech., A 74%: dark brown semi-solid). M.p. 54-55 A C B.p. 125 A C/0.0005 mmHg V.p. 2.9 A' 10-1 mPa (20 A C); 9.8 A' 10-1 mPa (separate studies) KOW logP = -0.22 (calc.) S.g./density 1.22 kg/l (20 A C). Solubility In water 100% (20 A C). In methanol 100%, acetone 70%, n-octanol 25%, toluene 6% (all 20 A C). Sparingly soluble in kerosene and diesel oil. Stability Decomposes >38 A C, thermal run-away reactions can occur >55 A C; on hydrolysis (20 A C), DT50 (calc.) 96 d (pH 5), 66 d (pH 7), 17 d (pH 9); unstable in short-chain alcohols. Decomposes on some inert materials (care should be taken when carrying out chromatography).