Mechanistic aspects of the thermal formation of halogenated organic compounds including polychlorinated dibenzo‐p‐dioxins

摘要: Polychlorinated dibenzofurans (PCDFs) are thermally formed from polychlorinated biphenyls (PCBs) via general reaction routes. The pyrolysis of 3H and 14C labelled phenol o‐ p‐cresols at 665°‐865°C indicates that the mechanism thermal production dibenzofuran is temperature dependent. thermolysis chlorinated phenols, ‐phenoxyacetic acids, their salts ‐phenoxy‐2‐phenols yield dibenzo‐p‐dioxins (PCDDs). On thermodegradation diphenyl ethers, ester 2,4,5‐T benzenes, a mixture PCDFs PCDDs obtained. 1,2‐Ketocarbene species involved in formation dibenzo‐p‐dioxin salt o‐halophenol.