Rhodium-grafted hydrotalcite catalyst for heterogeneous 1,4-addition reaction of organoboron reagents to electron deficient olefins
作者:Ken Motokura、Norifumi Hashimoto、Takayoshi Hara、Takato Mitsudome、Tomoo Mizugaki、Koichiro Jitsukawa、Kiyotomi Kaneda
DOI:10.1039/c1gc15146k
日期:——
hydrotalcite (Rh/HT) was prepared by the treatment of a Mg–Al mixed hydroxide (hydrotalcite, HT) with an aqueous RhCl3·nH2O solution. The formation of the RhIII species on the HT surface was confirmed by X-ray absorption fine structure spectroscopy. The Rh/HT catalyst was demonstrated to effectively promote the 1,4-addition reaction of organoboron reagents to electron-deficient olefins in both organic and aqueous
通过用RhCl 3 · n H 2 O水溶液处理Mg-Al混合氢氧化物(水滑石,HT)来制备铑接枝的水滑石(Rh / HT)。HT表面上Rh III物种的形成通过以下方法得以证实X射线吸收精细结构光谱。Rh / HT催化剂 被证明可以有效地促进有机硼试剂的1,4-加成反应至电子不足 烯烃 无论是有机的还是水性的 溶剂。HT的强表面碱性有助于形成具有高亲核性的Rh-OH物种,从而导致有机硼试剂的有效重金属化。由于Rh / HT表面的双功能性,该催化剂体系还可用于2-氰基3-,3-二苯基丙酸酯的一锅三组分合成。