Ring-cleavage reactions of aromatic hydrocarbons studied by FT-IR spectroscopy. II. Photooxidation of o-, m-, and p-xylenes in the NOx-air system.
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概要
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α-Dicarbonyl compounds produced in the photooxidation of <I>o</I>-, <I>m</I>-, and <I>p</I>-xylenes were analyzed quantitatively using long-path FT–IR spectroscopy. Glyoxal, methylglyoxal, and biacetyl were observed in the case of <I>o</I>-xylene, and glyoxal and methylglyoxal were observed in cases of <I>m</I>- and <I>p</I>-xylenes. Yields of glyoxal, methylglyoxal, and biacetyl were 8, 23, and 10% (mole/mole) of <I>o</I>-xylene consumed, respectively. Yields of glyoxal and methylglyoxal were 13 and 42% in the case of <I>m</I>-xylene, and 24 and 12% in the case of <I>p</I>-xylene. These yields could be explained by the ring cleavage of 6,7-dioxabicyclo[3.2.1]octane compounds of OH–aromatics-O<SUB>2</SUB> adduct. Formations of maleic anhydride was observed in the case of <I>o</I>-xylene and it is suggested that maleic anhydride is produced from <I>cis</I>-2-butenedial. Formation of 3-hexene-2,5-dione (unsaturated γ-dicarbonyl) was observed from <I>p</I>-xylene. The ring-cleavage process accounts for 41, 55, and 36% of the total reaction in <I>o</I>-, <I>m</I>-, and <I>p</I>-xylenes, respectively.
- 公益社団法人 日本化学会の論文
著者
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Bandow Hiroshi
Division Of Atmospheric Environment The National Institute For Environmental Studies
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WASHIDA Nobuaki
Division of Atmospheric Environment, The National Institute for Environmental Studies
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BANDOW Hiroshi
Division of Atmospheric Environment, The National Institute for Environmental Studies
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