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Diels\u2013Alder reaction of\n                    <jats:bold>6<\/jats:bold>\n                    and benzdiyne gave adducts\n                    <jats:bold>14<\/jats:bold>\n                    ,\n                    <jats:bold>15\u2009a<\/jats:bold>\n                    , and\n                    <jats:bold>15\u2009b<\/jats:bold>\n                    along with a trace amount of porphyrin(2.1.2.1) barrel\n                    <jats:bold>13<\/jats:bold>\n                    . Stepwise routes using\n                    <jats:bold>14<\/jats:bold>\n                    or\n                    <jats:bold>15\u2009a\/15\u2009b<\/jats:bold>\n                    as a substrate allowed for the synthesis of\n                    <jats:bold>13<\/jats:bold>\n                    as a single stereoisomer. The nanobarrel structure for\n                    <jats:bold>13<\/jats:bold>\n                    was revealed by X\u2010ray diffraction, where its cavity held two chloroform molecules via C\u2212H\u22c5\u22c5\u22c5\u03c0 interaction. DFT calculations revealed that the electrostatic attraction was dominant with binding energy of 32.8\u2005kcal\u2009mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    .\n                  <\/jats:p>","DOI":"10.1002\/anie.202201327","type":"journal-article","created":{"date-parts":[[2022,3,4]],"date-time":"2022-03-04T14:43:18Z","timestamp":1646404998000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Low\u2010Valent Zirconocene\u2010Mediated Synthesis of Porphyrin(2.1.2.1)s and Its Extension to Synthesis of a Porphyrin(2.1.2.1) Nanobarrel"],"prefix":"10.1002","volume":"61","author":[{"given":"Yidan","family":"Wu","sequence":"first","affiliation":[{"name":"Key Laboratory of Chemical Biology and Traditional Chinese Medicine Ministry of Educational of China Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province College of Chemistry and Chemical 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