Reactions of Diphenyl Ether with Chlorine and Bromine Atoms Around 750 K – Relevance for Gas-Phase “Dioxin” Formation
✍ Scribed by Izabela Wiater; Robert Louw
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 126 KB
- Volume
- 1999
- Category
- Article
- ISSN
- 1434-193X
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✦ Synopsis
The title reactions have been studied to scrutinize rate data this basis, the displacements of Cl and Br from the benzene ring by phenoxy radicals must have activation energies recently inferred for the two reverse steps -reaction of phenoxy radicals with chlorobenzene and bromobenzene -above 20 kcal/mol, and are therefore slow. As a consequence, formation of "dioxins" from halogenated which were at variance with commonly accepted model values. Both with chlorine and bromine atoms, splitting to phenols, in (slow) combustion, should proceed by combination of two (halo)phenoxy radicals rather than by halobenzene and phenoxy radical was found to occur in competition with abstraction of o-, m-, p-hydrogen atoms. On displacement of (ortho-)halogen in a halophenol molecule.
S&T's notation). PD was believed to react rapidly to a