Journal
ACS CATALYSIS
Volume 12, Issue 1, Pages 146-155Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c04537
Keywords
alkyne semihydrogenation; (E)-selective hydrogenation; nickel; silyl; pincer complex
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Funding
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Dalhousie University
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The study presents a novel Ni-based pre-catalyst for the (E)-selective semihydrogenation of alkynes, exhibiting high selectivity under mild conditions through facile alkyne insertion and subsequent alkene isomerization.
The selective semihydrogenation of alkynes to (E)-alkenes is a challenging transformation that is of significant synthetic interest. The development of direct hydrogenation catalysts for this transformation that are based on earth-abundant 3d transition metals and are tolerant of diverse functional groups is highly sought after. We report herein that the bis(phosphino)silyl Ni hydride complex (Pr-i-PSiPInd)NiH (1) is an effective pre-catalyst for the (E)-selective semihydrogenation of a broad range of diaryl alkynes and SiMe3-protected terminal alkynes. Complex 1 exhibits this reactivity under mild conditions (1 atm H-2, 25-50 degrees C, and 1-2.5 mol % Ni) to afford the corresponding (E)-alkenes with high selectivity. Stoichiometric experiments reveal that facile alkyne insertion and subsequent alkene isomerization lead to the observed selectivity.
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