甲基丙烯酸甲酯、甲基丙烯酸与分子氧的初始氧化反应

The Initial Oxidations of MMA and MAA by Molecular Oxygen

本文研究了甲基丙烯酸（ＭＡＡ）及其甲酯（ＭＭＡ）与分子氧Ｏ＿２的初始氧化反应。随着通Ｏ＿２后密封放置时间的增加，ＭＭＡ中所生成的氢过氧化物浓度逐渐增加；而ＭＡＡ中却无变化。ＩＲ、ＮＭＲ的分析结果表明：ＭＭＡ的α－甲基发生氧化反应，生成氢过氧化物，ＭＡＡ分子中－ＣＯＯＨ 使得生成的过氧化氢基团发生进一步的分解反应，生成醛基。

Methyl methacrylate (MMA) and methylacrylic acid(MAA) can form the contact charge transfer complex(CCT) with O2,respectively.After O2 was bubbled,the concentration of hydroperoxide in MMA increased with the increasing of oxidation time,however,it did not increase in MAA. From the IR,NMR spectra,it showed that the initial oxidation occured on the α-methyl group of MMA and MAA molecules via MMA-O2 CCT and MAAO2 CCT,respectively. In the case of MAA,the hydroperoxide group would further decompose and produce an aldehyde group.