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In this work, the first method is described for the conversion of polyesters into value\u2010added compounds catalyzed by a magnesium catalyst. It is demonstrated that the commercially available, inexpensive and air\u2010stable, alkaline earth magnesium catalyst Mg(OTf)<jats:sub>2<\/jats:sub> efficiently promotes the reductive depolymerization of several polyesters using pinacolborane (HBpin) as the reducing agent with good to excellent yields. This catalyst also remains very active in at least 12 consecutive polycaprolactone (PCL) reductive depolymerization reactions with yields between 89% and 81%. This magnesium catalyst is also efficient in the reductive depolymerization of the polycarbonate poly(bisphenol A carbonate) (PC.BPA). Furthermore, it is found that Mg(OTf)<jats:sub>2<\/jats:sub> also successfully catalyzes the methanolysis of polyesters and polycarbonates at moderate temperature with excellent yields.<\/jats:p>","DOI":"10.1002\/adsu.202400042","type":"journal-article","created":{"date-parts":[[2024,5,15]],"date-time":"2024-05-15T04:23:24Z","timestamp":1715747004000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Mg(OTf)<sub>2<\/sub> as an Excellent Catalyst for the Reductive Depolymerization and Methanolysis of Polyesters and Polycarbonates"],"prefix":"10.1002","volume":"8","author":[{"given":"Carlota M.","family":"Alfaia","sequence":"first","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural Institute of Molecular Sciences Departamento de Engenharia Qu\u00edmica Instituto Superior T\u00e9cnico Universidade de Lisboa  Av. Rovisco Pais Lisboa 1049\u2010001 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5919-7723","authenticated-orcid":false,"given":"Ana C.","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural Institute of Molecular Sciences Departamento de Engenharia Qu\u00edmica Instituto Superior T\u00e9cnico Universidade de Lisboa  Av. Rovisco Pais Lisboa 1049\u2010001 Portugal"}]}],"member":"311","published-online":{"date-parts":[[2024,5,15]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.2c01717"},{"key":"e_1_2_7_2_1","first-page":"341","volume-title":"Methodologies in Amine Synthesis: Challenges and Applications","author":"Fernandes A. C.","year":"2020"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/cssc.202001955"},{"key":"e_1_2_7_4_1","volume":"4","author":"Sadraei S. I.","year":"2018","journal-title":"Phys. Sci. 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