Catalog Home Page

Formation of dibenzofuran, dibenzo-p-dioxin and their hydroxylated derivatives from catechol

Altarawneh, M. and Dlugogorski, B.Z. (2015) Formation of dibenzofuran, dibenzo-p-dioxin and their hydroxylated derivatives from catechol. Physical Chemistry Chemical Physics, 17 (3). pp. 1822-1830.

[img]
Preview
PDF - Published Version
Download (1MB)
Link to Published Version: http://dx.doi.org/10.1039/C4CP04168B
*Subscription may be required

Abstract

We present, in this study, mechanistic and kinetic accounts of the formation of dibenzofuran (DF), dibenzo-p-dioxin (DD) and their hydroxylated derivatives (OHs-DF/OHs-DD) from the catechol (CT) molecule, as a model compound for phenolic constituents in biomass. Self-condensation of two CT molecules produces predominantly a DD molecule via open- and closed-shell corridors. Coupling modes involving the o-semiquinone radical and the CT molecule (o-SQ/CT) generate two direct structural blocks for the formation of OHs-DF/OHs-DD structures, ether-type intermediates and di-keto moieties. The calculated reaction rate constants indicate that the fate of ether-type intermediates is to make hydroxylated diphenyl ethers rather than to undergo cyclisation reactions leading to the formation of preDF structures. Unimolecular loss of a H or OH moiety from a pivotal carbon in these hydroxylated diphenyl ethers then produces hydroxylated and non-hydroxylated DD molecules. Formation of OHs-DF initiated by o(C)–o(C) cross-linkages involving o-SQ/o-SQ and o-SQ/CT reactions incurs very similar reaction and activation enthalpies encountered in the formation of chlorinated DFs from chlorophenols.

Publication Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Royal Society of Chemistry
Copyright: © 2014 Royal Society of Chemistry
URI: http://researchrepository.murdoch.edu.au/id/eprint/24866
Item Control Page Item Control Page

Downloads

Downloads per month over past year