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This transformation belongs to a unique class of reactions with the fundamental characteristic of the cleavage of the aromatic structure. By investigating the unusual coordination chemistry of N\u2010confused pyriporphyrin with silver and gold ions, we observed this process and obtained several complexes that exhibited remarkable reactivity. This includes the reversible cleavage of C\u2013O bonds and the selective demetallation of the outer metal ion.<\/jats:p>","DOI":"10.1002\/anie.202525506","type":"journal-article","created":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T06:10:17Z","timestamp":1769839817000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Pyridine Into Pyrrole Transformation Induced Within the Confinement of the Macrocycle"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8570-5688","authenticated-orcid":false,"given":"Paulina","family":"Krzyszowska","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Wroclaw  Wroclaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Agata","family":"Burska\u2010Jab\u0142o\u0144ska","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Wroclaw  Wroclaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mateusz","family":"Oberski","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Wroclaw  Wroclaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4890-2156","authenticated-orcid":false,"given":"Micha\u0142 J.","family":"Bia\u0142ek","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Wroclaw  Wroclaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1230-9075","authenticated-orcid":false,"given":"Lechos\u0142aw","family":"Latos\u2010Gra\u017cy\u0144ski","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Wroclaw  Wroclaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5749-7658","authenticated-orcid":false,"given":"Karolina","family":"Hurej","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Wroclaw  Wroclaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,1,30]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202303394"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2CS00784C"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201811138"},{"key":"e_1_2_7_5_1","first-page":"181","volume-title":"Metal\u2010Ligand Co\u2010operativity: Catalysis and the Pincer\u2010Metal Platform","author":"Hurej K.","year":"2021"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.6b00326"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/D3CC03139J"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/ol0612307"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200900280"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/ejoc.200600364"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/ejoc.200500496"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1021\/ol071052x"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3765(20011203)7:23<5113::AID-CHEM5113>3.0.CO;2-V"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1021\/ol035232s"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1039\/C5DT04566E"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/chem.201100780"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/ol0363265"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.1c00694"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja00045a039"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/chem.201604458"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1002\/chem.201304162"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.trechm.2025.08.014"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.abo4282"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202512288"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010024\u201007474\u20101"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41557\u2010023\u201001428\u20102"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1039\/D1GC00487E"},{"key":"e_1_2_7_28_1","unstructured":"Deposition number 2501626 (for4) contains the supplementary crystallographic data for this paper. 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