Epoxidation of olefins catalyzed by novel Mn(III) and Mo(IV)-Salen complexes immobilized on mesoporous silica gel Part II: Study of the catalytic epoxidation of olefins
Epoxidation of olefins catalyzed by novel Mn(III) and Mo(IV)-Salen complexes immobilized on mesoporous silica gel Part II: Study of the catalytic epoxidation of olefins
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DOI：
10.1016/j.molcata.2007.04.010
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发表时间：
2007-08
影响因子：
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通讯作者：
T. Luts;René Frank;W. Suprun;Sebastian Fritzsche;E. Hey‐Hawkins;H. Papp
中科院分区：
文献类型：
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作者：
T. Luts;René Frank;W. Suprun;Sebastian Fritzsche;E. Hey‐Hawkins;H. Papp
Mn（III）和Mo（IV）-Salen络合物均相固定在硅胶表面上，以叔丁基过氧化氢（TBHP）和过氧化氢（HP）为氧化剂，催化环辛烯和环己烯的环氧化反应。考察了反应条件对环氧化物产率的影响，以及不同催化剂对环氧化反应速率的影响。本文研究了锰及其络合物对TBHP的催化分解作用。比较了肽固定化Salen复合物与酯结合的Salen复合物的催化活性。固定化催化剂在多次重复使用中表现出稳定的催化活性。Mo-Salen络合物均相和固定化后对环辛烯的环氧化反应具有较高的催化活性，而Mn-Salen络合物体系则导致过氧化氢的非生产性分解。
Mn(III) and Mo(IV)-Salen complexes homogeneous and immobilized on a silica surface have been tested in the catalytic epoxidation of cyclooctene and cyclohexene with tert-butylhydroperoxide (TBHP) and hydrogen peroxide (HP) as an oxidant. The effects of reaction conditions on the epoxide yield as well as the epoxidation rate with different catalysts have been established. The catalytic decomposition of TBHP by manganese and molybdenum-Salen complexes has been studied. The peptide immobilized Salen complexes were compared in catalytic activity with ester bound ones. The immobilized catalysts show stable catalytic activity in manifold reuses. The Mo-Salen complexes homogeneous as well as immobilized exhibited high catalytic activity for the epoxidation of cyclooctene, whereas Mn-Salen complex systems cause additionally non-productive decomposition of hydroperoxide.