Synthesis and Characterization of 3,5-Bis(di-tert-butylphosphinito)pyridine Pincer Complexes

Creators: Swisher, Nicholas A.; Grubbs, Robert H.

Abstract

The synthesis of some "reverse pyridine" bis(phosphinite) pincer complexes of nickel and rhodium is reported. N-Functionalization of a POCOP ligand with a borane Lewis acid was found to permit cyclometalation with metal precursors, which reacted with the free base ligand in an undesired manner. Convenient removal of the coordinated Lewis acid was accomplished using polymer-supported 4-dimethylaminopyridine. The effects of borane Lewis acid coordination on the physical and spectroscopic properties of the pincer complexes were also assessed.

Additional Information

© 2020 American Chemical Society. Received 21 April 2020. Published online 1 July 2020. The authors acknowledge King Fahd University of Petroleum and Minerals for funding. The authors wish to thank Dr. Michael C. Haibach for helpful discussions. Dr. Michael K. Takase is acknowledged for X-ray crystallographic analysis, and Dr. Mona Shagholi and Naseem Torian are thanked for mass spectrometry assistance. Mr. Lawrence Henling and Dr. Michael K. Takase are thanked for performing elemental analysis. Accession Codes: CCDC 1996108 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, or by emailing data_request@ccdc.cam.ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033. The authors declare no competing financial interest.

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