Abstract

5-Methyl-4-[(propylsulfanyl)methyl]-2,4-dihydro-3H-pyrazol-3-one was shown to inhibit the radical-chain peroxidation of 1,4-dioxane, ethylbenzene, and methyl oleate. One peroxyl radical is trapped by each (propylsulfanylmethyl)-substituted 2,4-dihydro-3H-pyrazol-3-one molecule. The reaction rate constant of the compound with a peroxyl radical depends on the structure of the latter and decreases in the series: peroxyl radical of 1,4-dioxane, ethylbenzene, and methyl oleate (k₇ × 10⁴, L mol ^–1 s^–1, 333 K: 5.7, 4.1, 1.1). The reason for the observed dependence was discussed.

中文翻译：

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过氧自由基与5-甲基-4-[（炔丙基硫烷基）甲基] -2,4-二氢-3 H-吡唑-3-酮的反应性

摘要

显示5-甲基-4-[（丙基硫烷基）甲基] -2,4-二氢-3 H-吡唑-3-酮抑制1,4-二恶烷，乙苯和油酸甲酯的自由基链过氧化。每个（丙基硫烷基甲基）-取代的2,4-二氢-3 H-吡唑-3-一个分子均捕获一个过氧自由基。化合物与过氧自由基的反应速率常数取决于后者的结构，并以下列顺序递减：1,4-二恶烷，乙苯和油酸甲酯的过氧自由基（k ₇ ×10 ⁴，L mol ^–1 s ^-1，333 K：5.7，4.1，1.1）。讨论了观察到的依赖性的原因。