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J Am Chem Soc. 2011 Jun 29;133(25):9662-5. doi: 10.1021/ja202375y. Epub 2011 Jun 7.

Low-valent ene-amido iron complexes for the asymmetric transfer hydrogenation of acetophenone without base.

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  • 1Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6.


Examination of the role of base in the activation of our previously reported iron(II) complexes having the general formula [Fe(CO)(Br)(PNNP)][BPh(4)] revealed a five-coordinate iron(II) complex in which the tetradentate PNNP ligand had been doubly deprotonated. The new iron(II) complexes were used in the transfer hydrogenation of acetophenone in isopropanol in the absence of added base, and certain analogues showed catalytic activity.

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