Ru<sup>II</sup> complexes of 1,2,3-triazole appended tertiary phosphines, [P(Ph){(<i>o</i>-C<sub>6</sub>H<sub>4</sub>)(1,2,3-N<sub>3</sub>C(Ph)CH}<sub>2</sub>] and [P(Ph){<i>o</i>-C<sub>6</sub>H<sub>4</sub>(CCH)-(1,2,3-N<sub>3</sub>-Ph)}<sub>2</sub>]: highly active catalysts for transfer hydrogenation of carbonyl/nitro compounds and for α-alkylation of ketones
作者:Pavan K. Namdeo、Sonu Sheokand、Basvaraj S. Kote、Latchupatula Radhakrishna、Harish S. Kunchur、Prateek Saini、Srinivasan Ramakrishnan、Maravanji S. Balakrishna
DOI:10.1039/d2dt00361a
日期:——
to excellent yields. The free energy of β-hydride elimination from the respective Ru-alkoxide intermediates, a key mechanistic step common to all the three catalytic pathways, was calculated to be close to ergoneutral by density functional theory-based calculations, which is posited to rationalize the catalytic activity of 3. The reduction of aromatic nitro compounds was found to be highly chemoselective
合成两种新的 1,2,3-三唑单膦 [P(Ph)( o -C 6 H 4 )(1,2,3-N 3 C(Ph)CH} 2 ] ( 1 ) 和 [描述了P(Ph) o -C 6 H 4 (CCH)(1,2,3-N 3 -Ph)} 2 ] ( 2 ) 及其 Ru II配合物。1和2与 [Ru( PPh 3 ) 3 Cl 2 ] 以 1:1 的摩尔比产生阳离子配合物3和4, 分别。这两种配合物对转移氢化、硝基还原和α-烷基化反应均表现出非常高的催化活性,并以良好至优异的产率提供了相应的产物。通过基于密度泛函理论的计算,计算出从各自的 Ru-烷氧化物中间体消除 β-氢化物的自由能,这是所有三种催化途径共有的关键机制步骤,接近于人体工学中性,这有望使催化反应合理化3的活动。发现芳族硝基化合物的还原具有高度的化学选择性,即使在羰基存在的情况下也会产生相应的胺作为主要产物。三唑基-N2 配位的 Ru II