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872
Y. Zhao et al.
LETTER
In summary, we demonstrated a novel, efficient, and high-
ly selective semihydrogenation of alkynes to Z-alkenes
using HEH catalyzed by Pd/C. Although terminal alkynes
gave low yields of the alkenes, high selectivity of Z-al-
kenes, no E-alkenes generation, and relatively border sub-
strate scope make this procedure attractive. Further
investigation including more efficient catalytic systems
and expansion of the substrate scope is under way in our
laboratory.
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