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Synthesis and reactivity of iridium complexes of a macrocyclic PNP pincer ligand
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Hood, Thomas M. and Chaplin, Adrian B. (2021) Synthesis and reactivity of iridium complexes of a macrocyclic PNP pincer ligand. Dalton Transactions, 50 (7). pp. 2472-2482. doi:10.1039/D0DT04303F ISSN 1477-9226.
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Official URL: https://doi.org/10.1039/D0DT04303F
Abstract
Having recently reported on the synthesis and rhodium complexes of the novel macrocyclic pincer ligand PNP-14, which is derived from lutidine and features terminal phosphine donors trans-substituted with a tetradecamethylene linker (Dalton Trans., 2020, 49, 2077–2086 and Dalton Trans., 2020, 49, 16649–16652), we herein describe our findings critically examining the chemistry of iridium homologues. The five-coordinate iridium(I) and iridium(III) complexes [Ir(PNP-14)(η2:η2-cyclooctadiene)][BArF4] and [Ir(PNP-14)(2,2′-biphenyl)][BArF4] are readily prepared and shown to be effective precursors for the generation of iridium(III) dihydride dihydrogen, iridium(I) bis(ethylene), and iridium(I) carbonyl derivatives that highlight important periodic trends by comparison to rhodium counterparts. Reaction of [Ir(PNP-14)H2(H2)][BArF4] with 3,3-dimethylbutene induced triple C–H bond activation of the methylene chain, yielding an iridium(III) allyl hydride derivative [Ir(PNP-14*)H][BArF4], whilst catalytic homocoupling of 3,3-dimethylbutyne into Z-tBuC[triple bond, length as m-dash]CCHCHtBu could be promoted at RT by [Ir(PNP-14)(η2:η2-cyclooctadiene)][BArF4] (TOFinitial = 28 h−1). The mechanism of the latter is proposed to involve formation and direct reaction of a vinylidene derivative with HC[triple bond, length as m-dash]CtBu outside of the macrocyclic ring and this suggestion is supported experimentally by isolation and crystallographic characterisation of a catalyst deactivation product.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QD Chemistry | ||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Organometallic compounds -- Synthesis, Organometallic chemistry, Complex compounds -- Synthesis, Iridium catalysts, Rhodium catalysts | ||||||||||||
| Journal or Publication Title: | Dalton Transactions | ||||||||||||
| Publisher: | Royal Society of Chemistry | ||||||||||||
| ISSN: | 1477-9226 | ||||||||||||
| Official Date: | 20 January 2021 | ||||||||||||
| Dates: |
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| Volume: | 50 | ||||||||||||
| Number: | 7 | ||||||||||||
| Page Range: | pp. 2472-2482 | ||||||||||||
| DOI: | 10.1039/D0DT04303F | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
| Date of first compliant deposit: | 20 January 2021 | ||||||||||||
| Date of first compliant Open Access: | 9 February 2021 | ||||||||||||
| RIOXX Funder/Project Grant: |
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