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首页> 外文期刊>Catalysis science & technology >Silica-supported metal acetylacetonate catalysts with a robust and flexible linker constructed by using 2-butoxy-3,4-dihydropyrans as dual anchoring reagents and ligand donors
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Silica-supported metal acetylacetonate catalysts with a robust and flexible linker constructed by using 2-butoxy-3,4-dihydropyrans as dual anchoring reagents and ligand donors

机译：Silica-supported乙酰丙酮金属催化剂一个健壮的和灵活的链接器由使用2-butoxy-3 4-dihydropyrans双锚定试剂和配位捐助者

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摘要

Anchoring of a metal complex catalyst onto a solid support with a covalent bond has been widely used in designing a recyclable catalyst at molecular level. However, the performance of the obtained solid catalyst relies heavily on the stability and flexibility of the linker between the metal complex and the solid support. A ring-opening reaction of 2-butoxy-3,4-dihydropyrans with mercaptan was known to produce 2-alkylated 1,3-dicarbonyl compounds, which featured good atom economy, excellent yield and mild conditions. With the aid of this reaction, we used, in this work, 2-butoxy-3,4-dihydropyrans as dual anchoring reagents and ligand donors to modify a ready-made SH-functionalized HMS. This opened an easy way to construct a robust and flexible linker for anchoring a metal acetylacetonate complex catalyst onto the HMS support. The thereby obtained HMS can be used to immobilize Cu(acac)(2), Zn(acac)(2) and Ru(acac)(3) complexes. The obtained solid catalysts were fully characterized by many physicochemical methods. In the selected reactions, these catalysts not only displayed better or comparable activity in various organic reactions as compared with their homogeneous counterparts but also were proved to be quite robust and can be recycled several times without significant loss of their activities.
机译：锚定的金属络合物催化剂在固体用共价键已广泛应用的支持在分子设计一个可回收的催化剂的水平。固体催化剂在很大程度上依赖于稳定金属和灵活性之间的链接复杂的和坚实的支持。反应2-butoxy-3, 4-dihydropyrans生产2-alkylated硫醇是已知的1、3-dicarbonyl化合物中好原子经济、优良的产量和温和条件。使用,在这工作,2-butoxy-3 4-dihydropyrans双锚定试剂和配位捐助者修改一个现成的SH-functionalized HMS。一个简单的方法来构建一个健壮的和开放灵活的连接器金属锚定乙酰丙酮复杂到HMS催化剂支持。固定铜(中航商用飞机有限公司)(2)、锌(中航商用飞机有限公司)(2)俄文(中航商用飞机有限公司)(3)复合物。催化剂完全由许多特点物理化学方法。反应,这些催化剂不仅显示在各种有机更好或类似的活动反应比较均匀同行也被证明是相当的健壮且可多次回收重大损失的活动。

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