Co-Immobilization of a Palladium-Bisphosphine Complex and Strong Organic Base on a Silica Surface for Heterogeneous Synergistic Catalysis
作者:Ken Motokura、Koki Saitoh、Hiroto Noda、Yohei Uemura、Wang-Jae Chun、Akimitsu Miyaji、Sho Yamaguchi、Toshihide Baba
DOI:10.1002/cctc.201501178
日期:2016.1
palladium–bisphosphine complex and a strong organic base, 1,4‐diazabicyclo[2.2.2]octane (DABCO), on a silica support was successfully achieved. The new catalyst structure was characterized by X‐ray photoelectron spectroscopy, solid‐state NMR spectroscopy, X‐ray absorption fine structure spectroscopy, and elemental analysis. Although the local structure of the Pd–bisphosphine complex was unaffected by the
成功实现了钯-双膦配合物和强有机碱1,4-二氮杂双环[2.2.2]辛烷(DABCO)在二氧化硅载体上的共固定化。新的催化剂结构通过X射线光电子能谱,固态NMR光谱,X射线吸收精细结构能谱和元素分析来表征。尽管在同一二氧化硅表面上存在DABCO不会影响Pd-双膦配合物的局部结构,但是由于亲核反应的进行,其在亲核试剂的烯丙基化反应中的催化活性得到了显着增强,营业额(TON)高达> 10000。 Pd配合物和DABCO对底物分子的活化作用。