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The cavity-containing polymer was modified with inorganic Br\u00f8nsted acid (OWO\n                    <jats:sub>3<\/jats:sub>\n                    H) to simultaneously use host-guest and acidic aspects of this catalyst in 4\n                    <jats:italic>H<\/jats:italic>\n                    -pyrans.\n                  <\/jats:p>","DOI":"10.1039\/d3ra00804e","type":"journal-article","created":{"date-parts":[[2023,5,2]],"date-time":"2023-05-02T05:04:26Z","timestamp":1683003866000},"page":"13374-13383","update-policy":"https:\/\/doi.org\/10.1039\/rsc_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Tungstic acid-functionalized polycalix[4]resorcinarene as a cavity-containing hyper-branched supramolecular and recoverable acidic catalyst in 4\n                    <i>H<\/i>\n                    -pyran synthesis"],"prefix":"10.1039","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5610-7710","authenticated-orcid":false,"given":"Aref","family":"Mahmoudi Asl","sequence":"first","affiliation":[{"name":"Department of Chemistry, Yasouj University, P. 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