Simple salts of abundant metals (Fe, Bi, and Ti) supported on montmorillonite as efficient and recyclable catalysts for regioselective intramolecular and intermolecular hydroalkoxylation reactions of double bonds and tandem processes
conditions has been studied using two types of solid catalysts, namely montmorillonite (MMT) doped with metal cations and metal nanoparticles supported on oxides. In the case of intramolecular reactions, 38–99% yields of cyclic ethers have been obtained using Fe-MMT and Bi-MMT both in CH3NO2 and dimethyl carbonate (DMC) compared with other supported metal salts or metal nanoparticles. In the case of more challenging
已经使用两种类型的固体催化剂,即掺杂有金属阳离子的蒙脱石(MMT)和负载在氧化物上的金属纳米颗粒,研究了烯烃的催化加氢烷氧基化反应从均相转化为非均相条件的过程。在分子内反应的情况下,在CH 3 NO 2中使用Fe-MMT和Bi-MMT均可获得38-99%的环状醚收率碳酸二甲酯(DMC)与其他负载型金属盐或金属纳米粒子相比。在更具挑战性的分子间反应的情况下,使用金属掺杂的MMT(例如Fe-,Bi-和Ti-MMT)也可以获得高达72%的转化率和高达54%的产率。在本文中,我们详细介绍了被识别为真正异质催化过程的底物范围和限制,适用于两类反应和串联过程,它们在流动中的移位以及有关活性物质的一些机理见解。作为一般趋势,观察到三取代的双键在分子内和分子间反应中均能获得最佳结果。在Fe-MMT和Bi-MMT的情况下,均相催化剂成功转移到非均相催化剂上,在Bi-MMT的情况下,甚至可以提高催化活性。
Simple metal salts supported on montmorillonite as recyclable catalysts for intramolecular hydroalkoxylation of double bonds in conventional and VOC-exempt solvents
hydroalkoxylation of double bonds. A heterogeneous catalyst based on the impregnation of benign metals such as iron and bismuth on montmorillonite was used for a highly atom-economic transformation in DMC, a non-VOC solvent. The transformation allowed the formation of a large range of cyclic ethers from the corresponding unsaturated alcohols and the catalyst could be recycled several times.
Alkylation of phenol by nerol in the presence of organoaluminum compounds
作者:I. Yu. Chukicheva、I. V. Fedorova、A. A. Koroleva、A. V. Kuchin
DOI:10.1007/s10600-012-0303-4
日期:2012.9
Alkylation of aluminum phenolate by nerol and of phenol by nerol in the presence of the organoaluminum compounds aluminum phenolate and aluminumisopropylate was studied. The reaction products were isolated and characterized. Several features of the process were determined. It was found that ortho-substitution of the aromatic ring occurred primarily. In several instances nerol was cyclized. The fraction