{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T15:47:43Z","timestamp":1775749663211,"version":"3.50.1"},"reference-count":24,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2025,11,20]],"date-time":"2025-11-20T00:00:00Z","timestamp":1763596800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,11,20]],"date-time":"2025-11-20T00:00:00Z","timestamp":1763596800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100004052","name":"King Abdullah University of Science and Technology","doi-asserted-by":"publisher","award":["BAS\/1\/1342\u201001\u201001"],"award-info":[{"award-number":["BAS\/1\/1342\u201001\u201001"]}],"id":[{"id":"10.13039\/501100004052","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2026,1,16]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    A novel 1,5\u2010(bis\u2010borinane)pentane (1,5\u2010BBP) has been developed for polyhomologation (C1 polymerization), enabling the synthesis of well\u2010defined \u03b1,\u03c9\u2010hydroxy polymethylene (PM) with controlled molar masses and narrow polydispersity at elevated temperatures. The structural integrity and complete difunctionality of the PM were confirmed by\n                    <jats:sup>1<\/jats:sup>\n                    H NMR,\n                    <jats:sup>1<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    B NMR, matrix\u2010assisted laser desorption\/ionization time\u2010of\u2010flight mass spectrometry (MALDI\u2010TOF MS), and SEC analyses. Achieving perfectly linear polyethylene (PE), an analog to PM, without branching remains a longstanding synthetic challenge, as even trace defects disrupt lamellar packing and reduce crystallinity. We address this limitation through the introduction of a monomer purification strategy for dimethyl sulfoxonium methylide in C1 polymerization that, for the first time, reduces residual branching to\u00a0&lt;0.04%, as confirmed by quantitative\n                    <jats:sup>1<\/jats:sup>\n                    <jats:sup>3<\/jats:sup>\n                    C NMR. The resulting nascent PM exhibits exceptional properties, including enthalpies of fusion up to 290 J\u00b7g\n                    <jats:sup>\u22121<\/jats:sup>\n                    , melting temperatures of 138 \u00b0C\u2013143.15 \u00b0C, and crystallinity values of 93.8%\u201399.1% (DSC) and 92.0%\u201395.9% (WAXS). Solid\u2010state 2D\n                    <jats:sup>1<\/jats:sup>\n                    H\u2010\n                    <jats:sup>1<\/jats:sup>\n                    <jats:sup>3<\/jats:sup>\n                    C cross\u2010polarization magic angle spinningwide\u2010line separation (CP\u2013MAS WISE) NMR spectra further confirm predominantly crystalline domains with minimal amorphous content. This study demonstrates that precise control over initiator design, monomer purity, and reaction conditions enables \u03b1,\u03c9\u2010hydroxy\u2010terminated PM with crystallinity approaching the theoretical limits.\n                  <\/jats:p>","DOI":"10.1002\/anie.202522171","type":"journal-article","created":{"date-parts":[[2025,11,21]],"date-time":"2025-11-21T06:53:51Z","timestamp":1763708031000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Perfectly Linear \u03b1,\u03c9\u2010Hydroxy\u2010Terminated Polyethylene with Near\u2010Ideal Crystallinity"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8083-6996","authenticated-orcid":false,"given":"Naganath","family":"Patil","sequence":"first","affiliation":[{"name":"Polymer Synthesis Laboratory Chemistry Program KAUST Catalysis Center Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4576-0818","authenticated-orcid":false,"given":"Noor","family":"Albarbari","sequence":"additional","affiliation":[{"name":"Polymer Synthesis Laboratory Chemistry Program KAUST Catalysis Center Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1442-1714","authenticated-orcid":false,"given":"Nikos","family":"Hadjichristidis","sequence":"additional","affiliation":[{"name":"Polymer Synthesis Laboratory Chemistry Program KAUST Catalysis Center Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi 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