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
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, lactoneformation and base induced elimination of the lactone. The direct carboxylation of olefins is possible using nickel catalysts
Nickel-Catalyzed Direct Carboxylation of Olefins with CO<sub>2</sub>: One-Pot Synthesis of α,β-Unsaturated Carboxylic Acid Salts
作者:Núria Huguet、Ivana Jevtovikj、Alvaro Gordillo、Michael L. Lejkowski、Ronald Lindner、Miriam Bru、Andrey Y. Khalimon、Frank Rominger、Stephan A. Schunk、Peter Hofmann、Michael Limbach
DOI:10.1002/chem.201405528
日期:2014.12.15
The nickel‐catalyzed direct carboxylation of alkenes with the cheap and abundantly available C1 building block carbon dioxide (CO2) in the presence of a base has been achieved. The one‐pot reaction allows for the direct and selective synthesis of a wide range of α,β‐unsaturated carboxylates (TON>100, TOF up to 6 h−1, TON=turnover number, TOF=turnover frequency). Thus, it is possible, in one step, to
在碱的存在下,已经实现了镍的烯烃与便宜且可大量利用的C 1结构单元二氧化碳(CO 2)的镍直接催化羧化反应。一锅法反应可直接和选择性地合成各种α,β-不饱和羧酸盐(TON> 100,TOF高达6 h -1,TON =周转数,TOF =周转频率)。因此,可以在一个步骤中由乙烯,CO 2和钠盐合成丙烯酸钠。丙烯酸酯是工业上重要的产品,迄今为止其合成需要多个步骤。