Methyltrioxorhenium heterogenized on commercially available supporting materials as cyclooctene metathesis catalyst
作者:Alexandra M.J. Rost、Horst Schneider、Jochen P. Zoller、Wolfgang A. Herrmann、Fritz E. Kühn
DOI:10.1016/j.jorganchem.2005.07.051
日期:2005.11
materials. Metathesis experiments with cis-cyclooctene as substrate are performed aiming at a high yield of low molecular weight metathesis products (dimers, trimers, tetramers), which are interesting for aroma and flavour industries. Up to ca. 60% of these desired products can be obtained. A high rhenium loading leads usually to good catalytic activities of the materials in the cyclooctene metathesis. Prolonged
通过在真空下升华,将甲基三氧杂M(MTO)固定在各种市售支持材料上。最多可以将15 wt%的MTO(Re的10 wt%)固定在不同的支撑材料上。顺式置换实验旨在以高产量的低分子量复分解产物(二聚体,三聚体,四聚体)为目标,以β-环辛烯为底物,这对于香精和香料工业是令人感兴趣的。最多约 可以得到这些所需产物的60%。高loading含量通常会导致材料在环辛烯复分解中具有良好的催化活性。延长的反应时间导致高分子量复分解产物的更高产率。当相同的催化剂材料在若干次催化运行中重复使用时,接枝的Re化合物的浸出起着越来越重要的作用,导致催化剂性能下降。但是,没有经过审查的可商购的载体材料,