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Here, we demonstrate the first synthesis of a macrocycle consisting entirely of 5,15\u2010linked porphyrins. This porphyrin octadecamer was constructed using a covalent six\u2010armed template, made by cobalt\u2010catalyzed cyclotrimerization of an H\u2010shaped tolan with porphyrin trimer ends. The porphyrins around the circumference of the nanoring were linked together by intramolecular oxidative\n                    <jats:italic>meso\u2010meso<\/jats:italic>\n                    coupling and partial \u03b2\u2010\u03b2 fusion, to give a nanoring consisting of six edge\u2010fused zinc(II) porphyrin dimer units and six un\u2010fused nickel(II) porphyrins. STM imaging on a gold surface confirms the size and shape of the spoked 18\u2010porphyrin nanoring (calculated diameter: 4.7\u2005nm).\n                  <\/jats:p>","DOI":"10.1002\/anie.202302114","type":"journal-article","created":{"date-parts":[[2023,3,6]],"date-time":"2023-03-06T13:43:40Z","timestamp":1678110220000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Covalent Template\u2010Directed Synthesis of a Spoked 18\u2010Porphyrin Nanoring**"],"prefix":"10.1002","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2724-8404","authenticated-orcid":false,"given":"Marcin A.","family":"Majewski","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Oxford Chemistry Research Laboratory  Oxford OX1 3TA UK"},{"name":"Current address: Faculty of Chemistry University of Wroc\u0142aw  ul. F. 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