Monomeric Metal Aqua Complexes in the Interlayer Space of Montmorillonites as Strong Lewis Acid Catalysts for Heterogeneous Carbon-Carbon Bond-Forming Reactions
作者:Tomonori Kawabata、Masaki Kato、Tomoo Mizugaki、Kohki Ebitani、Kiyotomi Kaneda
DOI:10.1002/chem.200400672
日期:2005.1
scandium catalysts (Cu(2+)- and Sc(3+)-monts) were easily prepared by treating Na(+)-mont with the aqueous solution of the copper nitrate and scandium triflate, respectively. The resulting Cu(2+)- and Sc(3+)-monts showed outstanding catalytic activities for a variety of carbon-carbon bond-forming reactions, such as the Michael reaction, the Sakurai-Hosomi allylation, and the Diels-Alder reaction, under
蒙脱土包裹的铜和scan催化剂(Cu(2 +)-和Sc(3 +)-monts)可以通过分别用硝酸铜和三氟甲磺酸scan的水溶液处理Na(+)-mont来轻松制备。所得的Cu(2 +)-和Sc(3 +)-monts对各种碳-碳键形成反应(例如Michael反应,Sakurai-Hosomi烯丙基化和Diels-Alder反应)表现出出色的催化活性在无溶剂或水性条件下使用。蒙特催化剂的显着活性归因于能够稳定金属阳离子的带负电荷的硅酸盐层。此外,这些催化剂可重复使用,而活性和选择性没有任何明显的损失。Cu(2 +)-mont催化的Michael反应通过三元复合物进行,其中1和2