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In this study, we achieved hydrogen\u2010controlled E\/CO non\u2010alternating copolymerization using late transition metal catalysts. This process results in linear PEs containing the desired non\u2010alternating in\u2010chain keto groups (1.0\u20139.3\u2005mol\u2009%) and with tunable molecular weights ranging from 43 to 195\u2005kDa. In this reaction, H<jats:sub>2<\/jats:sub> serves as a chain transfer agent, modulating the polymer's molecular weight, forming unique aldehyde endgroups and eliminating usual olefinic endgroups; CO undergoes non\u2010alternating insertion into the PE chain, resulting in a strictly non\u2010alternating structure (&gt;99\u2009%) for the keto\u2010PE. The dispersed incorporation of in\u2010chain keto groups retains bulk properties of PE and makes PE susceptible to photodegradation, which produces significantly lower molecular weight polymers and oligomers with unambiguous vinyl and acetyl terminals.<\/jats:p>","DOI":"10.1002\/anie.202410885","type":"journal-article","created":{"date-parts":[[2024,8,1]],"date-time":"2024-08-01T13:46:45Z","timestamp":1722520005000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Aldehyde End\u2010Capped Degradable Polyethylenes From Hydrogen\u2010Controlled Ethylene\/CO Copolymerization"],"prefix":"10.1002","volume":"63","author":[{"given":"Chuang","family":"Song","sequence":"first","affiliation":[{"name":"State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Renmin Street 5625 Changchun 130022 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dian","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Renmin Street 5625 Changchun 130022 China"},{"name":"School of Applied Chemistry and Engineering University of Science and Technology of China  Hefei 230026 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaoqun","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Renmin Street 5625 Changchun 130022 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhenxin","family":"Tang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Renmin Street 5625 Changchun 130022 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yingyun","family":"Long","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Renmin Street 5625 Changchun 130022 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuxing","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Renmin Street 5625 Changchun 130022 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2627-454X","authenticated-orcid":false,"given":"Zhongbao","family":"Jian","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Renmin Street 5625 Changchun 130022 China"},{"name":"School of Applied Chemistry and Engineering University of Science and Technology of China  Hefei 230026 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,9,20]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.5b00310"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41578-020-0190-4"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201400799"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.3c00587"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.abi8183"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.2c04563"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsmacrolett.2c00459"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsmacrolett.4c00313"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202110957"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1246\/bcsj.20230073"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.1c04964"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/cjoc.202200450"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.3c00769"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.31635\/ccschem.023.202303275"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1093\/nsr\/nwad039"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja070224i"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202204126"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.4c01322"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1002\/mren.200900001"},{"key":"e_1_2_8_20_1","first-page":"11","volume":"138","author":"Matsko M. 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