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Pd-N,N,N′,N′-tetra(diphenylphosphinomethyl)-1,2-ethylenediamine was used for Heck coupling reaction and showed a good activity. When the molar ratio of substrate to palladium was 1000, the yield of the coupling product was up to 99% for activated aryl bromides and 58% for aryl chloride. 31 P NMR in situ indicated that the good activity of this system results from the active palladium species...
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