Alkaline earth metal oxides as solid bases for ligand-free Heck reaction

作者：Chen Fengxi^*; Lin Ivy; Li Henan; Gan Geok Joo; Toh Kelvin; Tham Lijun

来源：Catalysis Communications, 2007, 8(12): 2053-2058.

DOI：10.1016/j.catcom.2007.04.018

• ligand-free heck reaction
• solid base
• alkaline earth metal oxides

Alkaline earth metal oxides (MO, M = Mg, Ca, Sr and Ba) are investigated as solid bases for ligand-free Heck reaction (Pd concentration: 0.05 mol%). SrO is efficient to promote Heck arylation of styrene with bromobenzene (BB). However, aryl amination of BB to form N,N-dimethylaniline is also observed with SrO. CaO-n particles (n: calcination temperature) are prepared by calcination of dried Ca(NO3)(2) aqueous solution at 700 or 900 degrees C. The CaO-n particles outperform other alkaline earth metal oxides considering both BB conversion and selectivity to Heck products. The CaO-900 particles show better performance than the CaO-700 particles. This is attributed to their platelet morphology with sharp edges and corners and the preferential growth along the (111) crystal plane.

• 出版日期2007-12
• 单位南阳理工学院