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OH-Radical Induced Oxidation of Phenoxyacetic Acid and 2,4-Dichlorophenoxyacetic Acid Primary Radical Steps and Products

机译:OH自由基诱导的苯氧乙酸和2,4-二氯苯氧乙酸的氧化主要自由基步骤和产物

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摘要

The reactions of ~·OH radicals with 2,4-dichlorophenoxyacetic acid (2,4-D), k = (6.6 ± 0.5) * 10~9 M~(-1) s~(-1), phenoxyacetic acid (PAA), k = (10 ± 1) * 10~9 M~(-1) s~(-1), and 2,4-dichlorophenol (2,4-DCP), k = (7.1 ± 0.5) to the ring at positions not occupied by substitute groups were oxidized by K_3[Fe(CN)_6], with the corresponding hydroxylated species analyzed by HPLC. The distribution of ~·H radical addition to the aromatic ring of 2,4-D is C1, 17%; C2/C4, 20%; C3/C5/C6, 47%; and for ~·OH reaction with PAA, it is C1, 5.5%; C2/C6, 45%; C3/C5, 11%; C4, 36%. Whereas the hydroxycyclohexadienyl radicals of 2,4-D have no observable reactivity toward oxygen, those of PAA and 2,4-DCP do react, with k(~·OH adduct-PAA) + O_2 = (5.1 ± 0.2) * 10~8 M~(-1) s~(-1) and k(~·OH adduct-2,4-DCP) + O_2 = (1,1 ± 0.1) * 10~8 M~(-1) s~(-1). The phenoxyl radicals formed by chloride elimination form the ipso-chloro-~·OH adducts of 2,4-D rapidly oxidize TMPD to TMPD~(·+), k = (3.6 ± 0.5) * 10~9 M~(-1) s~(-1).
机译:〜·OH自由基与2,4-二氯苯氧基乙酸(2,4-D)的反应,k =(6.6±0.5)* 10〜9 M〜(-1)s〜(-1),苯氧基乙酸(PAA ),k =(10±1)* 10〜9 M〜(-1)s〜(-1)和2,4-二氯苯酚(2,4-DCP),k =(7.1±0.5)环在未被取代基占据的位置上,被K_3 [Fe(CN)_6]氧化,并通过HPLC分析相应的羟基化物质。 2,4-D芳香环中〜·H自由基加成的分布为C1,17%; C2 / C4,20%; C3 / C5 / C6,47%;与PAA ~~ OH反应的C1为5.5%; C2 / C6,45%; C3 / C5,11%; C4,36%。尽管2,4-D的羟基环己二烯基对氧气没有可观察到的反应性,但PAA和2,4-DCP的羟基确实会发生反应,与k(〜·OH加合物-PAA)+ O_2 =(5.1±0.2)* 10〜 8 M〜(-1)s〜(-1)和k(〜·OH加合物-2,4-DCP)+ O_2 =(1.1±0.1)* 10〜8 M〜(-1)s〜( -1)。通过氯化物消除形成的苯氧基自由基形成2,4-D的ipso-chloro-〜·OH加合物,将TMPD迅速氧化为TMPD〜(·+),k =(3.6±0.5)* 10〜9 M〜(-1 )s〜(-1)。

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