Investigations on the catalytic carboxylation of olefins with CO<sub>2</sub> towards α,β-unsaturated carboxylic acid salts: characterization of intermediates and ligands as well as substrate effects
作者:Ivana Jevtovikj、Simone Manzini、Matthias Hanauer、Frank Rominger、Thomas Schaub
DOI:10.1039/c5dt01040c
日期:——
salts and a detailed investigation on the critical steps in the catalysis are reported. The influence of two chelating phosphine ligands and several olefins on the elemental steps of the catalysis is shown. The work focusses on the formation of intermediate olefin complexes, lactone formation and base induced elimination of the lactone. The direct carboxylation of olefins is possible using nickel catalysts
报道了乙烯以外的烯烃向α,β-不饱和羧酸盐的羧化以及对催化关键步骤的详细研究。显示了两种螯合膦配体和几种烯烃对催化元素步骤的影响。这项工作集中在中间烯烃配合物的形成,内酯的形成和碱引起的内酯的消除上。使用镍催化剂可以使烯烃直接羧化,这开辟了一条通往所需α,β-不饱和羧酸盐的新途径。该反应对1,3-二烯特别有效,并通过烯丙基羧酸盐的形成。在这种情况下,形成这种烯丙基型内酯复合物的能力似乎是向满意的营业额迈出的最具挑战性的一步。