Etridiazole
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| Names | |
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| IUPAC name
5-ethoxy-3-(trichloromethyl)-1,2,4-thiadiazole
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| Identifiers | |
3D model (JSmol)
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| ECHA InfoCard | 100.018.175 |
| EC Number |
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CompTox Dashboard (EPA)
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| Properties | |
| C5H5Cl3N2OS | |
| Molar mass | 247.518 g mol-1 |
| Appearance | Pale yellow liquid with a mild, persistent odour |
| Density | 1.497 g cm-3 [1] |
| Melting point | 22°C |
| Boiling point | 95°C at 1 mmHg |
| 0.117 g dm-3 | |
| log P | 3.37 |
| Vapor pressure | 0.011 mmHg/1.43 Pa at 25°C |
| Acidity (pKa) | 2.27 |
| Hazards | |
| Flash point | 154.5°C |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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1028 mg/kg (rat, oral) 2000 mg/kg (mouse, oral) 779 mg/kg (rabbit, oral) 1700 mg/kg (rabbit, dermal) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Etridiazole is a fungicide and pesticide used for prevention of pythium ultimum on cotton plants.[2]
Synthesis
Etridiazole can be synthesised from acetonitrile as follows:
It can also be is produced by the reaction of trichloroacetamidine hydrochloride with trichloromethanesulfenyl chloride, and then with sodium hydroxide in ethanol[3].
Reactivity
Etridiazole is stable under normal conditions[4], but degrades upon continuous exposure to sunlight[5], and is hydrolysed by alkalis[6]. When heated to decomposition, it emits toxic fumes of hydrogen chloride, sulfur oxides, and nitrogen oxides[7].
Safety
Etridiazole has been classified as a Group B2 Probably Human Carcinogen[8].
References
- ^ MacBean C, ed; e-Pesticide Manual. 15th ed., ver. 5.1, Alton, UK; British Crop Protection Council. Etridazole (2593-15-9) (2008-2010)
- ^ "Applying a Fungicide May Prevent Cotton Replanting". Ag Alert. March 27, 2002.
- ^ Muller F et al; Ullmann's Encyclopedia of Industrial Chemistry 7th ed. (1999-2012). NY, NY: John Wiley & Sons; Fungicides, Agricultural, 2. Individual Fungicides. Online Posting Date: October 15, 2011
- ^ Worthing, C.R., S.B. Walker (eds.). The Pesticide Manual - A World Compendium. 7th ed. Lavenham, Suffolk, Great Britain: The Lavenham Press Limited, 1983., p. 252
- ^ Tomlin, C.D.S. (ed.). The Pesticide Manual - World Compendium. 10th ed. Surrey, UK: The British Crop Protection Council, 1994., p. 420
- ^ Spencer, E. Y. Guide to the Chemicals Used in Crop Protection. 7th ed. Publication 1093. Research Institute, Agriculture Canada, Ottawa, Canada: Information Canada, 1982., p. 279
- ^ Lewis, R.J. Sr. (ed) Sax's Dangerous Properties of Industrial Materials. 11th Edition. Wiley-Interscience, Wiley & Sons, Inc. Hoboken, NJ. 2004., p. 1623
- ^ USEPA Office of Pesticide Programs, Health Effects Division, Science Information Management Branch: "Chemicals Evaluated for Carcinogenic Potential" (April 2006)
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