Chemistry:Isobenzan
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| Names | |
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| IUPAC name
1,3,4,5,6,7,8,8-Octachloro-1,3,3a,4,7,7a-hexahydro-4,7-methanoisobenzofuran
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| Other names
Telodrin; 1,3,4,5,6,7,8,8-Octachloro-4,7-methylene-3a,4,7,7a-tetrahydro-isobenzofuran
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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| UNII | |
| UN number | 2761 |
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| Properties | |
| C9H4Cl8O | |
| Molar mass | 411.73 g·mol−1 |
| Appearance | Whitish to light brown crystalline powder |
| Density | 1.87 g/cm3 |
| Melting point | 121.3 °C (250.3 °F; 394.4 K) |
| Practically insoluble | |
| Hazards | |
| GHS pictograms |   
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| GHS Signal word | Danger |
| H300, H310, H320, H361, H370, H372, H410 | |
| P201, P202, P260, P262, P264, P270, P273, P280, P281, P301+310, P302+350, P305+351+338, P307+311, P308+313, P310, P314, P321, P322, P330, P337+313, P361, P363, P391, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
Isobenzan (telodrin) is a highly toxic organochloride insecticide. It was produced only in the period from 1958 to 1965 and its use has been since discontinued.[1] It is a persistent organic pollutant that can remain in soil for 2 to 7 years, and the biological half-life of isobenzan in human blood is estimated to be about 2.8 years.[1]
It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.[3]
Production
The precursor 4,5,6,7,10,10-hexachloro-4,7-endomethylene-4,7,8,9-tetrahydrophthalane can be obtained in two synthetic routes. In a synthesis method report published in 1954, 1,4,5,6,7,7-hexachloro-2,3-bishydroxymethylbicyclo[2,2,1]hept-5-ene is obtained, which is then dehydrated to the precursor.[4] In 1961, a direct preparation of the precursor via a Diels-Alder reaction with hexachlorocyclopentadiene and 2,5-Dihydrofuran was found.[5] The target compound is then synthesized by photochlorination of the precursor.[6][4][7][8]
References
- ↑ 1.0 1.1 1.2 Isobenzan, International Programme on Chemical Safety
- ↑ Isobenzan at Sigma-Aldrich
- ↑ 40 C.F.R.: Appendix A to Part 355—The List of Extremely Hazardous Substances and Their Threshold Planning Quantities (Report) (July 1, 2008 ed.). Government Printing Office. http://edocket.access.gpo.gov/cfr_2008/julqtr/pdf/40cfr355AppA.pdf. Retrieved October 29, 2011.
- ↑ 4.0 4.1 , Feichtinger; Tummes Hans & Puschhof Siegfried"Chlorinated 4,5,6,7,10,10-hexachloro-4,7-endomethylene - 4,7,8,9 - tetrahydrophthalane insecticides" patent US3000907A, issued 1961-09-19
- ↑ Riemschneider, R.; Gallert, H.; Andres, P. (1961). "Zur Chemie von Polyhalocyclopentadienen, 22. Mitt.: Über die Herstellung von 1,4,5,6,7,7-Hexachlorbicyclo[2.2.1]hepten-(5)-bishydroxymethylen-(2,3)" (in de). Monatshefte für Chemie 92 (5): 1075–1079. doi:10.1007/BF00924776.
- ↑ , Dr Hans; Dr Hans Tummes & Siegfried Puschhof"Insecticides and processes for their manufacture" patent DE1020346B, issued 1957-12-05
- ↑ Feichtinger, H.; Linden, H. W. (1965). "Telodrin, its synthesis and derivatives". Chemistry & Industry 47: 1938–1940. PMID 5846097.
- ↑ Feichtinger, H.; Linden, H.-W.: Friedel-Crafts-Reaktionen 1-substituierter 4.5.6.7.10.10-Hexachlor-4.7-methylen-4.7.8.9-tetrahydro-phthalane in Chem. Ber. 97 (1964) 2779–2784, doi:10.1002/cber.19640971009.
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