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We have developed a Pd(0)–polyethyleneimine [Pd(0)–PEI] complex for the selective partial hydrogenation of alkynes to the corresponding alkenes. Notably, Pd(0)–PEI catalyzed the partial hydrogenation of mono-substituted alkynes with an excellent selectivity (77–100%), which was very difficult to achieve even with the Lindlar catalyst. Moreover, the use of Pd(0)–PEI led to no reduction in the other...
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