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首页> 外文期刊>Inorganic Chemistry Communications >Propanal synthesis from aqueous propylene glycol'hydrogen peroxide on a Ru'alumina catalyst
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Propanal synthesis from aqueous propylene glycol'hydrogen peroxide on a Ru'alumina catalyst

机译：在Ru'alumina催化剂上由丙二醇过氧化氢水溶液进行丙烷合成

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The conversion of polyol materials,including 1,2-diols,into higher commodity chemicals is actively being pursued by many researchers. Here we report the production of propanal from aqueous propylene glycol and hydrogen peroxide using a Ru'alumina catalyst. Experiments were conducted by adding up to four peroxide equivalents under steady-state reflux conditions at 371 K. The product propanal and its subsequent reaction product with substrate,1,3-dioxolane-2-ethyl-4-methyl,was observed to be an intermediate achieving a maximum concentration of 3% of substrate. Buffering using Mg(OH)2 at pH ~ 10 resulted in propanal formation,whereas buffering at similar pH using Na2HPO4 did not,from which we propose that magnesium acts as a promoter in the reaction. The mechanism appears to be a dehydration to enol,followed by rearrangement to product. Experiments utilizing Ru'carbon did not yield any propanol suggesting that the acidic sites of alumina aid the dehydration reaction. To our knowledge,this represents the first time hydrogen peroxide has been used in an alcohol dehydration reaction. Published by Elsevier B.V.
机译：许多研究人员积极地追求将包括1,2-二醇在内的多元醇材料转化为高级商品化学品。在这里，我们报告使用Ru'alumina催化剂由丙二醇水溶液和过氧化氢生产丙醛。通过在371 K的稳态回流条件下添加最多四个过氧化物当量进行实验。观察到丙醛产物及其随后与底物1，，3-二氧戊环-2-乙基-4-甲基的反应产物是中间体的最大浓度为底物的3％。在pH约为10的条件下使用Mg（OH）2缓冲会形成丙醛，而在Na2HPO4的相似pH条件下则不会形成丙醛，因此我们建议镁在反应中起促进剂的作用。该机理似乎是脱水成烯醇，随后是重排成产物。利用Ru'carbon进行的实验未产生任何丙醇，表明氧化铝的酸性位点有助于脱水反应。据我们所知，这是首次将过氧化氢用于酒精脱水反应。由Elsevier B.V.发布

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