{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,6]],"date-time":"2026-06-06T14:52:21Z","timestamp":1780757541111,"version":"3.54.1"},"reference-count":84,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2021,7,3]],"date-time":"2021-07-03T00:00:00Z","timestamp":1625270400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>In this review, we describe the synthesis and use in hydrogen transfer reactions of ruthenacycles and iridacycles. The review limits itself to metallacycles where a ligand is bound in bidentate fashion to either ruthenium or iridium via a carbon\u2013metal sigma bond, as well as a dative bond from a heteroatom or an N-heterocyclic carbene. Pincer complexes fall outside the scope. Described are applications in (asymmetric) transfer hydrogenation of aldehydes, ketones, and imines, as well as reductive aminations. Oxidation reactions, i.e., classical Oppenauer oxidation, which is the reverse of transfer hydrogenation, as well as dehydrogenations and oxidations with oxygen, are described. Racemizations of alcohols and secondary amines are also catalyzed by ruthenacycles and iridacycles.<\/jats:p>","DOI":"10.3390\/molecules26134076","type":"journal-article","created":{"date-parts":[[2021,7,4]],"date-time":"2021-07-04T22:34:36Z","timestamp":1625438076000},"page":"4076","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Ruthenacycles and Iridacycles as Transfer Hydrogenation Catalysts"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8480-1491","authenticated-orcid":false,"given":"Vincent","family":"Ritleng","sequence":"first","affiliation":[{"name":"Ecole europ\u00e9enne de Chimie, Polym\u00e8res et Mat\u00e9riaux, Universit\u00e9 de Strasbourg, CNRS, LIMA, UMR 7042, 25 rue Becquerel, 67087 Strasbourg, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5245-7748","authenticated-orcid":false,"given":"Johannes G.","family":"de Vries","sequence":"additional","affiliation":[{"name":"Leibniz Institut f\u00fcr Katalyse, e. V. Albert-Einstein Strasse 29a, 18059 Rostock, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"576","DOI":"10.1021\/cr900279a","article-title":"Cyclometalation Using d-Block Transition Metals: Fundamental Aspects and Recent Trends","volume":"110","author":"Albrecht","year":"2010","journal-title":"Chem. Rev."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"3584","DOI":"10.1002\/anie.200454199","article-title":"Cyclometalated Ruthenium(II) Complexes as Highly Active Transfer Hydrogenation Catalysts","volume":"43","author":"Baratta","year":"2004","journal-title":"Angew. Chem. Int. 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