{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/39211"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/39211","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Supramolecular architectures: macrocycles, catenanes and polyrotaxanes","abstract":"Polyrotaxanes are molecular composites consisting of three components: linear polymers, bulky stoppers at the ends of polymer chains and macrocycles threaded by the polymers. A series of tetraarylmethyl derivatives as blocking groups were synthesized. Using tris(p-ten-butylphenyl)( 4-hydroxyphenyl)methane a new blocking groupfmitiator (BO(mit) was synthesized. The BG(mit's ability of blockingfmitiation in free radical polymerizations was established by polymerization of styrene. As cyclic components, aliphatic crown ethers (30-crown-lO, \"42-crown-14\" and \"6O-crown-20\") were synthesized by multi-piece combination methods. The purification of the crown ethers was achieved by treatment with poly(methacryloyl chloride), column chromatography and recrystallization; by NMR in DMSO-<i>d₆</i> the purity of the products was demonstrated. The 42-crown-based [2]catenane was isolated while synthesizing \"42- crown-14\" and characterized in terms of its physically interlocked structure. Two new hydrocarbon-based macrocycles were prepared by two-piece combination method.","abstract_html":"Polyrotaxanes are molecular composites consisting of three components: linear polymers, bulky stoppers at the ends of polymer chains and macrocycles threaded by the polymers. A series of tetraarylmethyl derivatives as blocking groups were synthesized. Using tris(p-ten-butylphenyl)( 4-hydroxyphenyl)methane a new blocking groupfmitiator (BO(mit) was synthesized. The BG(mit&#x27;s ability of blockingfmitiation in free radical polymerizations was established by polymerization of styrene. As cyclic components, aliphatic crown ethers (30-crown-lO, &quot;42-crown-14&quot; and &quot;6O-crown-20&quot;) were synthesized by multi-piece combination methods. The purification of the crown ethers was achieved by treatment with poly(methacryloyl chloride), column chromatography and recrystallization; by NMR in DMSO-&lt;i&gt;d₆&lt;/i&gt; the purity of the products was demonstrated. The 42-crown-based [2]catenane was isolated while synthesizing &quot;42- crown-14&quot; and characterized in terms of its physically interlocked structure. Two new hydrocarbon-based macrocycles were prepared by two-piece combination method.","abstract_has_math":false,"creators":["Lee, Sang-Hun"],"institution":"Virginia Tech","degree_name":"Ph. 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A series of tetraarylmethyl derivatives as blocking groups were synthesized. Using tris(p-ten-butylphenyl)( 4-hydroxyphenyl)methane a new blocking groupfmitiator (BO(mit) was synthesized. The BG(mit's ability of blockingfmitiation in free radical polymerizations was established by polymerization of styrene. As cyclic components, aliphatic crown ethers (30-crown-lO, \"42-crown-14\" and \"6O-crown-20\") were synthesized by multi-piece combination methods. The purification of the crown ethers was achieved by treatment with poly(methacryloyl chloride), column chromatography and recrystallization; by NMR in DMSO-<i>d₆</i> the purity of the products was demonstrated. The 42-crown-based [2]catenane was isolated while synthesizing \"42- crown-14\" and characterized in terms of its physically interlocked structure. Two new hydrocarbon-based macrocycles were prepared by two-piece combination method."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph. D."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["BTD"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Supramolecular architectures: macrocycles, catenanes and polyrotaxanes"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Gibson, Harry W."],"dc:contributor.committeemember":["Dorn, Harry C.","Marand, Herve","Merola, Joseph S.","Tanko, James M."],"dc:contributor.department":["Chemistry"],"dc:creator":["Lee, Sang-Hun"],"dc:date.accessioned":["2014-03-14T21:18:03Z"],"dc:date.available":["2014-03-14T21:18:03Z","2007-08-23"],"dc:date.issued":["1996-12-05"],"dc:description.abstract":["Polyrotaxanes are molecular composites consisting of three components: linear polymers, bulky stoppers at the ends of polymer chains and macrocycles threaded by the polymers. A series of tetraarylmethyl derivatives as blocking groups were synthesized. 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