{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T10:54:30Z","timestamp":1781520870702,"version":"3.54.1"},"reference-count":56,"publisher":"Wiley","issue":"20","license":[{"start":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T00:00:00Z","timestamp":1773360000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T00:00:00Z","timestamp":1773360000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Chemistry A European J"],"published-print":{"date-parts":[[2026,5,27]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Ring\u2011opening copolymerization (ROCOP) of readily available monomers such as cyclic acetals and cyclic anhydrides offers an atom\u2011economical alternative strategy, yet efficient catalytic systems enabling precise control over chain sequence and molecular weight remain scarce. Herein, we report the use of the organic Meerwein\u2011type ion pair [Me\n                    <jats:sub>3<\/jats:sub>\n                    O]\n                    <jats:sup>+<\/jats:sup>\n                    [B(C\n                    <jats:sub>6<\/jats:sub>\n                    F\n                    <jats:sub>5<\/jats:sub>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    ]\n                    <jats:sup>\u2212<\/jats:sup>\n                    as a highly active, metal\u2011free catalyst for the cationic ROCOP of cyclic acetals with cyclic anhydrides. This method affords structurally diverse poly(ether\u2011ester)s with tunable AB\/ABB\u2011type linkages (A\u00a0=\u00a0anhydride and B\u00a0=\u00a0formaldehyde). By varying polymerization time, temperature, and monomer feed ratio, the content of AB linkages could be precisely regulated from 58\u00a0mol% to a fully alternating architecture, while\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>n<\/jats:sub>\n                    reached up to 70.4\u00a0kDa. The scope of the methodology was extended to 3 cyclic acetals and 6 cyclic anhydrides, yielding a library of 14 well\u2011defined copolymers. This work provides a robust and versatile catalytic approach to sequence\u2011controlled, high\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>n<\/jats:sub>\n                    poly(ether\u2011ester)s, significantly enriching the synthetic toolbox for sustainable polymer materials.\n                  <\/jats:p>","DOI":"10.1002\/chem.202503662","type":"journal-article","created":{"date-parts":[[2026,3,14]],"date-time":"2026-03-14T06:16:05Z","timestamp":1773468965000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Meerwein Type Ion Pair Catalyzed Cationic Ring\u2010Opening Copolymerization of Cyclic Acetals and Cyclic Anhydrides"],"prefix":"10.1002","volume":"32","author":[{"given":"Huiwen","family":"Zong","sequence":"first","affiliation":[{"name":"Tianjin Key Laboratory of Composite &amp; Functional Materials School of Materials Science and Engineering Tianjin University  Tianjin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingqian","family":"Wang","sequence":"additional","affiliation":[{"name":"Tianjin Key Laboratory of Composite &amp; Functional Materials School of Materials Science and Engineering Tianjin University  Tianjin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiqiang","family":"Ding","sequence":"additional","affiliation":[{"name":"Tianjin Key Laboratory of Composite &amp; Functional Materials School of Materials Science and Engineering Tianjin University  Tianjin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Wang","sequence":"additional","affiliation":[{"name":"Tianjin Key Laboratory of Composite &amp; Functional Materials School of Materials Science and Engineering Tianjin University  Tianjin 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