{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T21:53:59Z","timestamp":1791842039574,"version":"4.3.4"},"reference-count":124,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2023,11,11]],"date-time":"2023-11-11T00:00:00Z","timestamp":1699660800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Lebanese University 2022","award":["037676"],"award-info":[{"award-number":["037676"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Catalytic transfer hydrogenation has emerged as a pivotal chemical process with transformative potential in various industries. This review highlights the significance of catalytic transfer hydrogenation, a reaction that facilitates the transfer of hydrogen from one molecule to another, using a distinct molecule as the hydrogen source in the presence of a catalyst. Unlike conventional direct hydrogenation, catalytic transfer hydrogenation offers numerous advantages, such as enhanced safety, cost-effective hydrogen donors, byproduct recyclability, catalyst accessibility, and the potential for catalytic asymmetric transfer hydrogenation, particularly with chiral ligands. Moreover, the diverse range of hydrogen donor molecules utilized in this reaction have been explored, shedding light on their unique properties and their impact on catalytic systems and the mechanism elucidation of some reactions. Alcohols such as methanol and isopropanol are prominent hydrogen donors, demonstrating remarkable efficacy in various reductions. Formic acid offers irreversible hydrogenation, preventing the occurrence of reverse reactions, and is extensively utilized in chiral compound synthesis. Unconventional donors such as 1,4-cyclohexadiene and glycerol have shown a good efficiency in reducing unsaturated compounds, with glycerol additionally serving as a green solvent in some transformations. The compatibility of these donors with various catalysts, substrates, and reaction conditions were all discussed. Furthermore, this paper outlines future trends which include the utilization of biomass-derived hydrogen donors, the exploration of hydrogen storage materials such as metal-organic frameworks (MOFs), catalyst development for enhanced activity and recyclability, and the utilization of eco-friendly solvents such as glycerol and ionic liquids. Innovative heating methods, diverse base materials, and continued research into catalyst-hydrogen donor interactions are aimed to shape the future of catalytic transfer hydrogenation, enhancing its selectivity and efficiency across various industries and applications.<\/jats:p>","DOI":"10.3390\/molecules28227541","type":"journal-article","created":{"date-parts":[[2023,11,13]],"date-time":"2023-11-13T02:46:47Z","timestamp":1699843607000},"page":"7541","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":85,"title":["Exploring Hydrogen Sources in Catalytic Transfer Hydrogenation: A Review of Unsaturated Compound Reduction"],"prefix":"10.3390","volume":"28","author":[{"given":"Batoul","family":"Taleb","sequence":"first","affiliation":[{"name":"Platform for Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Science and Technology, Lebanese University, Beirut P.O. Box 6573\/14, Lebanon"},{"name":"Department of Chemistry, Faculty of Science, Beirut Arab University, Debbieh P.O. Box 11-5020, Lebanon"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rabih","family":"Jahjah","sequence":"additional","affiliation":[{"name":"Platform for Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Science and Technology, Lebanese University, Beirut P.O. Box 6573\/14, Lebanon"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5205-3038","authenticated-orcid":false,"given":"David","family":"Cornu","sequence":"additional","affiliation":[{"name":"Institut Europ\u00e9en des Membranes (IEM), UMR 5635, University of Montpellier, ENSCM, CNRS, Place Eug\u00e8ne Bataillon, 34095 Montpellier, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2913-2846","authenticated-orcid":false,"given":"Mikhael","family":"Bechelany","sequence":"additional","affiliation":[{"name":"Institut Europ\u00e9en des Membranes (IEM), UMR 5635, University of Montpellier, ENSCM, CNRS, Place Eug\u00e8ne Bataillon, 34095 Montpellier, France"},{"name":"Applied Mathematics and Bioinformatics (CAMB), Gulf University for Science and Technology (GUST), Mubarak Al-Abdullah 32093, Kuwait"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9341-0716","authenticated-orcid":false,"given":"Mohamad","family":"Al Ajami","sequence":"additional","affiliation":[{"name":"Platform for Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Science and Technology, Lebanese University, Beirut P.O. Box 6573\/14, Lebanon"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ghenwa","family":"Kataya","sequence":"additional","affiliation":[{"name":"Platform for Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Science and Technology, Lebanese University, Beirut P.O. Box 6573\/14, Lebanon"},{"name":"Institut Europ\u00e9en des Membranes (IEM), UMR 5635, University of Montpellier, ENSCM, CNRS, Place Eug\u00e8ne Bataillon, 34095 Montpellier, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4984-8531","authenticated-orcid":false,"given":"Akram","family":"Hijazi","sequence":"additional","affiliation":[{"name":"Platform for Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Science and Technology, Lebanese University, Beirut P.O. Box 6573\/14, Lebanon"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammad H.","family":"El-Dakdouki","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Faculty of Science, Beirut Arab University, Debbieh P.O. Box 11-5020, Lebanon"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,11,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1007\/BF02543211","article-title":"Review of hydrogenation","volume":"16","author":"Whitner","year":"1939","journal-title":"Oil Soap"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Bar\u00e1th, E. (2018). Hydrogen Transfer Reactions of Carbonyls, Alkynes, and Alkenes with Noble Metals in the Presence of Alcohols\/Ethers and Amines as Hydrogen Donors. 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