Catalyst design of hydrotalcite compounds for efficient oxidations
Catalyst design of hydrotalcite compounds for efficient oxidations
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DOI：
10.1002/chin.200123233
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发表时间：
2000-03
期刊：
影响因子：
--
通讯作者：
K. Kaneda;K. Yamaguchi;K. Mori;T. Mizugaki;K. Ebitani
中科院分区：
文献类型：
--
作者：
K. Kaneda;K. Yamaguchi;K. Mori;T. Mizugaki;K. Ebitani
考察了不同镁铝型水滑石作为烯烃环氧化反应和吡啶N-氧化反应的催化剂。水滑石的催化活性随表面碱性的增加而提高。加入阳离子表面活性剂，例如，正十二烷基三甲基溴化铵对上述体系的反应速率明显加快。在水镁石层中引入Ru和Co阳离子的水滑石，被发现是在分子氧存在下用于各种醇的氧化的良好催化剂。此外，这些水滑石还可以顺利地催化二苯甲烷、芴和氧杂蒽在苄基位置的氧化反应，并具有优异的产率。该水滑石催化剂可以很容易地从反应混合物中分离出来并重复使用，同时保持了其对上述氧化反应的高催化性能。
Various Mg-Al type hydrotalcites were examined as catalysts for the epoxidation of olefins and N-oxidation of pyridines using hydrogen peroxide. The catalytic activity of hydrotalcites increased with increasing the basicity of their surface. Adding cationic surfactants, e.g., n-dodecyltrimethylammonium bromide, to the above system remarkably accelerated the reaction rate. The hydrotalcites, into which were introduced both Ru and Co cations in the Brucite layers, were found to be good catalysts for the oxidation of various alcohols in the presence of molecular oxygen. Moreover, these hydrotalcites could smoothly catalyze also the oxygenation of diphenylmethane, fluorene, and xanthene at benzylic position with excellent yields. The hydrotalcite catalysts could be easily separated from the reaction mixture and reused with retention of their high catalytic performance for the above oxidations.