Knölker complex explained

The Knölker complex is an organoiron compound, which is a catalyst for transfer hydrogenation.[1] The complex features an hydroxycyclopentadienyl ligand bound to an Fe(CO)2H centre. It is generated by the corresponding cyclopentadienone tricarbonyl by treatment with base followed by acidification.[2] The compound is related to the organoruthenium compound called Shvo's complex, a hydroxycyclopentadienyl derivative that also functions as a catalyst for hydrogenation.[3]

Notes and References

  1. 10.1021/ja071159f. 17439131. An Efficient and Chemoselective Iron Catalyst for the Hydrogenation of Ketones. Journal of the American Chemical Society. 129. 18. 5816–5817. 2007. Casey. Charles P.. Guan. Hairong.
  2. 10.1002/(SICI)1521-3773(19990712)38:13/14<2064::AID-ANIE2064>3.0.CO;2-W. Demetalation of Tricarbonyl(cyclopentadienone)iron Complexes Initiated by a Ligand Exchange Reaction with NaOH—X-Ray Analysis of a Complex with Nearly Square-Planar Coordinated Sodium. 1999. Knölker. Hans-Joachim. Baum. Elke. Goesmann. Helmut. Klauss. Rüdiger. Angewandte Chemie International Edition. 38. 13–14. 2064–2066. 34182704.
  3. 10.1002/anie.200703053. 17847139. An Iron Catalyst for Ketone Hydrogenations under Mild Conditions. 2007. Bullock. R. Morris. Angewandte Chemie International Edition. 46. 39. 7360–7363. free.

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