Incorporation of CO<sub>2</sub>in Butadiene Dimerization Catalyzed by Palladium Complexes. Formation of 2-Ethylidene-5-hepten-4-olide
作者:Yoshio Inoue、Yoshiyuki Sasaki、Harukichi Hashimoto
DOI:10.1246/bcsj.51.2375
日期:1978.8
Reaction of carbon dioxide with butadiene catalyzed by palladium–phosphine complexes was studied. When the reaction was carried out in certain polar, aprotic solvents, such as dimethylformamide (DMF), 2-ethylidene-5-hepten-4-olide was formed in about 5% yield by the incorporation of CO2 together with the formation of butadiene linear dimers. The main dimer was 1,3,7-octatriene. The ditertiary phosphines
研究了钯-膦配合物催化二氧化碳与丁二烯的反应。当反应在某些极性非质子溶剂,如二甲基甲酰胺 (DMF) 中进行时,通过引入 CO2 并形成线性丁二烯,以约 5% 的产率形成 2-ethylidene-5-hepten-4-olide二聚体。主要的二聚体是 1,3,7-辛三烯。发现二叔膦,R2PCH2CH2CH2PR2,其中R是甲基或苯基,被发现适合作为合成油酸酯的配体。提出了一种可能的机制,涉及 π-烯丙基、σ-烯丙基形式的 2 摩尔丁二烯和钯配合物的中间体。