{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T14:37:20Z","timestamp":1786977440888,"version":"build-2736575974"},"reference-count":47,"publisher":"Wiley","issue":"55","license":[{"start":{"date-parts":[[2025,8,6]],"date-time":"2025-08-06T00:00:00Z","timestamp":1754438400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/100015155","name":"International Polyurethane Technology Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100015155","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":[[2025,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Bifunctional iridium complexes having a \u03b2\u2010protic C\u2013N chelating pyrazole ligand catalyze the carboxylative cyclization of 1\u2010methylamino\u20102\u2010butyne under atmospheric CO\n                    <jats:sub>2<\/jats:sub>\n                    . This reaction affords a five\u2010membered cyclic urethane, along with a six\u2010membered regioisomer. Alkenyliridium(III) complexes as catalytic intermediate models are formed by stoichiometric reaction of related nonprotic pyrazole complexes with 1\u2010methylamino\u20102\u2010butyne and CO\n                    <jats:sub>2<\/jats:sub>\n                    in the presence of Ag\n                    <jats:sub>2<\/jats:sub>\n                    O, although the protic pyrazole analog is too unstable to be detected. In particular, the isolable\n                    <jats:italic>N<\/jats:italic>\n                    \u2010phenylpyrazole\u2010ligated alkenyliridium(III) complex with a cyclic urethane framework is characterized by X\u2010ray crystallography. The \u03b2\u2010protic pyrazole ligand would be capable of accelerating protonolysis of the alkenyl carbon\u2013iridium bond in the key intermediate, releasing the cyclic urethane product, and being responsible for the catalytic function.\n                  <\/jats:p>","DOI":"10.1002\/chem.202502024","type":"journal-article","created":{"date-parts":[[2025,8,6]],"date-time":"2025-08-06T12:47:30Z","timestamp":1754484450000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Metal\u2013Ligand Cooperation of Ir(III) Catalysts Bearing a \u03b2\u2010Protic Pyrazole Chelate in Carboxylative Cyclization of Propargylic Amine with CO\n                    <sub>2<\/sub>"],"prefix":"10.1002","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4685-8833","authenticated-orcid":false,"given":"Yoshihito","family":"Kayaki","sequence":"first","affiliation":[{"name":"Department of Chemical Science and Engineering School of 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