Branching Ratios for the Reaction of Selected Carbonyl-Containing Peroxy Radicals with Hydroperoxy Radicals
作者:Alam S. Hasson、Geoffrey S. Tyndall、John J. Orlando、Sukhdeep Singh、Samuel Q. Hernandez、Sean Campbell、Yesenia Ibarra
DOI:10.1021/jp211799c
日期:2012.6.21
important chemical sink for organic peroxy radicals (RO2) in the troposphere is reaction with hydroperoxy radicals (HO2). Although this reaction is typically assumed to form hydroperoxides as the major products (R1a), acetyl peroxy radicals and acetonyl peroxy radicals have been shown to undergo other reactions (R1b) and (R1c) with substantial branching ratios: RO2 + HO2 → ROOH + O2 (R1a), RO2 + HO2 →
对流层中有机过氧自由基(RO 2)的重要化学吸收剂是与氢过氧自由基(HO 2)的反应。尽管通常假定该反应会形成氢过氧化物作为主要产物(R1a),但已证明乙酰基过氧自由基和丙酮基过氧自由基会进行其他反应(R1b)和(R1c),并具有明显的支化比:RO 2 + HO 2 →ROOH + O 2(R1a),RO 2 + HO 2 →ROH + O 3(R1b),RO 2 + HO 2 →RO + OH + O 2(R1c)。理论工作表明,反应(R1b)和(R1c)可能是酰基过氧和α-羰基过氧自由基的一般特征。在这项工作中,得出了六个含羰基的过氧自由基的R1a–R1c的支化比:C 2 H 5 C(O)O 2,C 3 H 7 C(O)O 2,CH 3 C(O)CH 2 O 2,CH 3 C(O)CH(O 2)CH 3,CH 2 ClCH(O 2)C(O)CH 3和CH 2 ClC(CH 3)(O 2