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A novel deep eutectic solvent (DES)\u2010type catalyst, comprising a mixture of tetrabutylammonium iodide and levulinic acid in a 1:1.5 molar ratio, is introduced and thoroughly characterized. This mixture demonstrates efficiency under mild and solvent\u2010free conditions, providing improved selectivity and conversion rates compared to other related catalysts. This catalyst system (1.4\u2009mol%) operates at atmospheric pressure, avoiding the need for high\u2010pressure equipment while enhancing scalability. Furthermore, this procedure is considered an ideal approach from both economic and ecological perspectives, due to its 100% atom economy and reduced environmental impact, offering a promising, metal\u2010free and low\u2010toxicity alternative. Additionally, the DES\u2010type catalytic system can be recycled for at least three consecutive cycles while maintaining significant activity. Quantum chemistry calculations provide mechanistic insights supporting experimental findings. Overall, these findings underscore the potential of DES\u2010based systems to advance CO\n                    <jats:sub>2<\/jats:sub>\n                    utilization technologies, contributing to circular carbon strategies and sustainable chemical synthesis.\n                  <\/jats:p>","DOI":"10.1002\/cssc.70813","type":"journal-article","created":{"date-parts":[[2026,7,11]],"date-time":"2026-07-11T07:14:18Z","timestamp":1783754058000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Deep Eutectic Solvent\u2010Type Mixture as a Green Catalyst in the Solvent\u2010Free Cycloaddition of CO\n                    <sub>2<\/sub>\n                    and Epoxides"],"prefix":"10.1002","volume":"19","author":[{"given":"Tatiana","family":"Mart\u00ed","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica Org\u00e1nica Instituto de S\u00edntesis Org\u00e1nica (ISO) Facultad de Ciencias Universidad de Alicante  Alicante Spain"},{"name":"Kongsberg Discovery Spain  Alicante Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4914-2918","authenticated-orcid":false,"given":"Xavier","family":"Marset","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Org\u00e1nica Instituto de S\u00edntesis Org\u00e1nica (ISO) Facultad de Ciencias Universidad de Alicante  Alicante Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Celia","family":"Guillem","sequence":"additional","affiliation":[{"name":"Kongsberg Discovery Spain  Alicante Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5915-351X","authenticated-orcid":false,"given":"Gabriela","family":"Guillena","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Org\u00e1nica Instituto de S\u00edntesis Org\u00e1nica (ISO) Facultad de Ciencias Universidad de Alicante  Alicante Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9996-2426","authenticated-orcid":false,"given":"Santiago","family":"Aparicio","sequence":"additional","affiliation":[{"name":"Department of Chemistry \u2013 Institute of Critical Raw Materials (ICCRAM) University of Burgos  Burgos Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6784-0245","authenticated-orcid":false,"given":"Diego J.","family":"Ram\u00f3n","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Org\u00e1nica Instituto de S\u00edntesis Org\u00e1nica (ISO) Facultad de Ciencias Universidad de Alicante  Alicante Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,7,11]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jksus.2023.102693"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.checat.2023.100796"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s43247-021-00320-6"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scca.2023.100012"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-031-19999-8"},{"key":"e_1_2_9_7_1","first-page":"89","volume-title":"Chemical Transformations of Carbon Dioxide","author":"B\u00fcttner H.","year":"2018"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/cctc.201900401"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.rineng.2022.100711"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.0c05492"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scib.2021.04.004"},{"key":"e_1_2_9_12_1","doi-asserted-by":"crossref","unstructured":"T.Yan H.Liu Z. 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