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Subsequent deprotonation of 1a\u2013c and coordination of the in situ generated NHC ligands to CoBr2 led to the isolation of air-stable six-coordinate Co(III) complexes 2a\u2013c, respectively. All the salts and complexes were fully characterized. Single-crystal X-ray analysis of 2a and 2c showed octahedral Co centers hexacoordinated to two NHC carbons, two imine nitrogen atoms, and two phenolate oxygens in the form [C^N^O(Co3+)C^N^O]. The complexes were used in the catalytic transfer hydrogenation (CTH) of a range of ketones in 2-propanol as the solvent and hydrogen donor. Based on a low catalyst concentration of 0.4 mol %, significant conversions in the range of 70\u201399% were recorded at high turnover frequencies up to 1635 h\u20131. A mechanism to account for the steps involved in the CTH of cyclohexanone by complex 2a is proposed and supported by data from cyclic voltammetry, low-resolution mass spectrometry, UV, and IR spectroscopic techniques.<\/jats:p>","DOI":"10.1021\/acsomega.9b03181","type":"journal-article","created":{"date-parts":[[2020,2,6]],"date-time":"2020-02-06T09:45:18Z","timestamp":1580982318000},"page":"2670-2679","source":"Crossref","is-referenced-by-count":29,"title":["Transfer Hydrogenation\nof Ketones Catalyzed by Symmetric\nImino-N-heterocyclic Carbene Co(III) Complexes"],"prefix":"10.1021","volume":"5","author":[{"given":"Samaila","family":"Abubakar","sequence":"first","affiliation":[{"name":"University of KwaZulu-Natal , , Private Bag X54001 , ,","place":["Durban, South Africa, 4000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6302-6959","authenticated-orcid":true,"given":"Muhammad D.","family":"Bala","sequence":"additional","affiliation":[{"name":"University of KwaZulu-Natal , , Private Bag X54001 , ,","place":["Durban, South Africa, 4000"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2020,2,6]]},"reference":[{"key":"2026090204434964500_cit1","unstructured":"Zhu, X.; Hu, J.; Zheng, Q.; Yang, X.\n          Nitrogen Heterocyclic Carbene-Platinum Complex Catalyst\nand Its Preparation and Application. 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