Stereoselective Chromium‐Catalyzed Semi‐Hydrogenation of Alkynes

Autor: Bernhard J. Gregori, Axel Jacobi von Wangelin, Simon Pöllath, Anke Schoch, Matthias Bauer, Michal Nowakowski, Josef Zweck
Rok vydání: 2020
Předmět:
Zdroj: ChemCatChem 12(21), 5359-5363 (2020). doi:10.1002/cctc.202000994
ISSN: 1867-3899
1867-3880
2020-0099
DOI: 10.1002/cctc.202000994
Popis: ChemCatChem 12(21), 5359 - 5363 (2020). doi:10.1002/cctc.202000994
Chromium complexes have found very little applications as hydrogenation catalysts. Here, we report a Cr‐catalyzed semi‐hydrogenation of internal alkynes to the corresponding Z‐alkenes with good stereocontrol (up to 99/1 for dialkyl alkynes). The catalyst comprises the commercial reagents chromium(III) acetylacetonate, Cr(acac)$_3$, and diisobutylaluminium hydride, DIBAL−H, in THF. The semi‐hydrogenation operates at mild conditions (1‐5 bar H$_2$, 30 °C).
Published by WILEY-VCH Verlag, Weinheim
Databáze: OpenAIRE
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