Well-defined 25 nm nickel phosphide nanoparticles act as a colloidal catalyst for the chemoselective hydrogenation of terminal and internal alkynes. Cis-alkenes are obtained in mild conditions with good conversion and selectivity. The phosphorus inserted in the Ni-P nanoparticles is critical for the selectivity of the nanocatalyst. Mechanistic investigations using isotope labeling provide insight on the reactants interaction with the nanoparticles surface. They pinpoint the occurrence of C-H bond cleavage in terminal alkynes during the reaction. (C) 2012 Elsevier Ltd. All rights reserved.
Chemoselective hydroboration of alkynes vs. alkenes over gold catalysts
作者:Antonio Leyva、Xin Zhang、Avelino Corma
DOI:10.1039/b901953g
日期:——
Alkynes are preferentially hydroborated in the presence of alkenes when using gold catalysts; the active species involves a borane–gold interaction.