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Stereoselective Chromium‐Catalyzed Semi‐Hydrogenation of Alkynes

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Gregori, Bernhard J. ; Nowakowski, Michal ; Schoch, Anke ; Pöllath, Simon ; Zweck, Josef ; Bauer, Matthias ; Jacobi von Wangelin, Axel
Date of publication of this fulltext: 11 Oct 2021 12:44


Chromium complexes have found very little applications as hydrogenation catalysts. Here, we report a Cr-catalyzed semi-hydrogenation of internal alkynes to the correspondingZ-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 degrees C).

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