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Formation of mixed halogenated dibenzo-p-dioxins and dibenzofurans (PXDD/Fs)
Journal article   Peer reviewed

Formation of mixed halogenated dibenzo-p-dioxins and dibenzofurans (PXDD/Fs)

A. Saeed, M. Altarawneh and B.Z. Dlugogorski
Chemosphere, Vol.137, pp.149-156
2015
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Abstract

This contribution investigates mechanistic and kinetic parameters pertinent to formation of mixed dibenzo-p-dioxins and dibenzofurans (PXDD/Fs) from the condensation reactions involving 2-chlorophenoxy (2-CPxy) and 2-bromophenoxy (2-BPxy) radicals. Keto-ether structures act as direct intermediates for the formation of DD, 1-MCDD, 1-MBDD, 1-B,6-CDD and 1-B,9-CDD molecules. Likewise, diketo adducts initiate the formation of 4-MCDF, 4-MBDF and 4-B,6-CDF compounds through interconversion and rearrangement reactions. As formation mechanisms of halogenated dibenzo-p-dioxins and dibenzofurans from precursors of brominated and chlorinated phenols are insensitive to substitution at meta and para sites, our mechanistic and kinetic analysis of reactions involving 2-BPxy and 2-CPxy should also apply to higher halogenated phenoxy radicals.

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Citation topics
3 Agriculture, Environment & Ecology
3.60 Herbicides, Pesticides & Ground Poisoning
3.60.221 Persistent Organic Pollutants
Web Of Science research areas
Environmental Sciences
ESI research areas
Environment/Ecology
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