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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ultraviolet Photolysis of CH_2I_2 in Methanol:O-H Insertion and HI Elimination Reactions To Form a Dimethoxymethane Product
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Ultraviolet Photolysis of CH_2I_2 in Methanol:O-H Insertion and HI Elimination Reactions To Form a Dimethoxymethane Product

机译:CH_2I_2在甲醇中的紫外光解:O-H插入和HI消除反应形成二甲氧基甲烷产物

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摘要

Ultraviolet photolysis of low concentrations of CH_2I_2 in methanol solution found that CH_2I_2 is converted into dimethoxymethane and some H~+ and I~- products.Picosecond time-resolved resonance Raman (ps-TR~3) experiments observed that the isodiiodomethane (CH_2I-I) photoproduct decayed faster as the concentration of methanol increases,suggesting that isodiiodomethane is reacting with methanol.Ab initio calculations indicate isodiiodomethane is able to react with methanol via an O-H insertion/Hi elimination to form an iodoether (ICH_2-O-CH_3) and HI products.The iodoether can then further react via another O-H insertion/ HI elimination reaction to form the dimethoxymethane (CH_3-O-CH_2-O-CH_3) observed in the photochemistry experiments.A reaction mechanism consistent with these experimental and theoretical observations is proposed.
机译:甲醇溶液中低浓度CH_2I_2的紫外光解发现CH_2I_2转化为二甲氧基甲烷以及一些H〜+和I〜-产物。皮秒时间分辨共振拉曼(ps-TR〜3)实验观察到异碘甲烷(CH_2I-I )光产物随甲醇浓度的增加而更快地衰减,这表明异二碘甲烷正在与甲醇反应。从头算计算表明,异二碘甲烷能够通过OH插入/ Hi消除与甲醇反应形成碘醚(ICH_2-O-CH_3)和HI然后,碘醚可以通过另一个OH插入/ HI消除反应进一步反应,形成光化学实验中观察到的二甲氧基甲烷(CH_3-O-CH_2-O-CH_3),提出了与这些实验和理论观察相一致的反应机理。

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