{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:35:32Z","timestamp":1760240132560,"version":"build-2065373602"},"reference-count":58,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2019,2,26]],"date-time":"2019-02-26T00:00:00Z","timestamp":1551139200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UID\/QUI\/00100\/2013","PTDC\/QEQ-QIN\/3967\/2014"],"award-info":[{"award-number":["UID\/QUI\/00100\/2013","PTDC\/QEQ-QIN\/3967\/2014"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Catalysts"],"abstract":"<jats:p>The novel Schiff base complex [CoIIIZnIIL3Cl2]\u00b7CH3OH (1) was synthesized by interaction of zinc powder, cobalt(II) chloride and methanol solution of the pre-formed HL in air (HL is the product of condensation of o-vanillin and methylamine) and characterized by IR, UV-Vis and NMR spectroscopy, ESI-MS and single crystal X-ray diffraction analysis. In the heterometallic core of 1 the two metal centers are bridged by deprotonated phenoxy groups of the L\u2212 ligands with the cobalt-zinc separation of 3.123 \u00c5. Catalytic investigations demonstrated a pronounced activity of 1 towards mild alkane oxidation with m-chloroperbenzoic acid (m-CPBA) as an oxidant and cis-1,2-dimethylcyclohexane (cis-1,2-DMCH) as the model substrate. The influence of the nature of different promoting agents of various acidities (from HOTf to pyridine) on the catalytic process was studied in detail and a pronounced activity of 1 in the presence of nitric acid promoter was found, also showing a high retention of stereoconfiguration of the substrate (&gt;99% for cis-1,2-DMCH). The best achieved yield of tertiary cis-alcohol based on the oxidant was 61%, with a turnover number (TON) of 198 for nitric acid as promoter. The 18O-incorporations into the alcohols when the reactions were performed under 18O2 atmosphere using acetic and nitric acid promoters, suggest that the cis-1,2-DMCH hydroxylation proceeds by two distinct pathways, a non-stereoselective and a stereoselective one (with and without involvement of a long-lived free carbon radical, respectively). The former dominates in the case of acetic acid promoter and the latter is realized in the case of HNO3 promoter.<\/jats:p>","DOI":"10.3390\/catal9030209","type":"journal-article","created":{"date-parts":[[2019,2,26]],"date-time":"2019-02-26T11:00:44Z","timestamp":1551178844000},"page":"209","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Heterometallic CoIIIZnII Schiff Base Catalyst for Mild Hydroxylation of C(sp3)\u2013H Bonds of Unactivated Alkanes: Evidence for Dual Mechanism Controlled by the Promoter"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0114-6525","authenticated-orcid":false,"given":"Oksana V.","family":"Nesterova","sequence":"first","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]},{"given":"Katerina V.","family":"Kasyanova","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Taras Shevchenko National University of Kyiv, 64\/13 Volodymyrska str., Kyiv 01601, Ukraine"}]},{"given":"Elena A.","family":"Buvaylo","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Taras Shevchenko National University of Kyiv, 64\/13 Volodymyrska str., Kyiv 01601, Ukraine"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4315-8399","authenticated-orcid":false,"given":"Olga Yu.","family":"Vassilyeva","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Taras Shevchenko National University of Kyiv, 64\/13 Volodymyrska str., Kyiv 01601, Ukraine"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1515-6636","authenticated-orcid":false,"given":"Brian W.","family":"Skelton","sequence":"additional","affiliation":[{"name":"School of Molecular Sciences, M310, University of Western Australia, Perth, WA 6009, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1095-6888","authenticated-orcid":false,"given":"Dmytro S.","family":"Nesterov","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8323-888X","authenticated-orcid":false,"given":"Armando J.L.","family":"Pombeiro","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2019,2,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2296","DOI":"10.1002\/anie.201710377","article-title":"Increasing Catalyst Efficiency in C\u2013H Activation Catalysis","volume":"57","author":"Gensch","year":"2018","journal-title":"Angew. Chem. Int. 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