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. 2014 Oct 10;19(10):16291–16311. doi: 10.3390/molecules191016291

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© 2014 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 4 — (a) The hydroxlyation of benzoic acid initiated by e⁻_cb; (b) the hydroxlylation of benzoic acid initiated by h⁺_vb; (c) the hydroxlylation of benzoic acid via the path of one-electron oxidation by SO₄^∙⁻ [41].