Phosphetane Oxides as Redox Cycling Catalysts in the Catalytic Wittig Reaction at Room Temperature
作者:Lars Longwitz、Anke Spannenberg、Thomas Werner
DOI:10.1021/acscatal.9b02456
日期:2019.10.4
renewable solvent. The intermediates of the Wittig reaction were analyzed by 31P NMR spectroscopy, and in situ NMR experiments confirmed phosphaneoxide as the resting state of the catalyst. Further kinetic investigations revealed a striking influence of the base on the rate of phosphaneoxidereduction.
An effective protocol was developed for the Heck coupling reactions between various aryl halides and olefins. In the presence of 2 mol% of Pd(OAc) 2 , the desired products could be obtained in good yields under ligand-free and aerobic conditions. The catalytic system could be easily recycled for five times with high efficiency.