{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T13:40:52Z","timestamp":1792590052260,"version":"4.5.0"},"reference-count":0,"publisher":"The Scientific and Technological Research Council of Turkey (TUBITAK-ULAKBIM) - DIGITAL COMMONS JOURNALS","issue":"4","license":[{"start":{"date-parts":[[2024,8,20]],"date-time":"2024-08-20T00:00:00Z","timestamp":1724112000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Turkish Journal of Chemistry"],"abstract":"<jats:p>Cinchona alkaloid-derived sulfonamides and ester dimers containing chiral hyperbranched polymers have been successfully synthesized and applied as catalysts in asymmetric reactions. Several hyperbranched polymers derived from cinchona alkaloids, incorporating sulfonamides and esters, were synthesized through Mizoroki\u2013Heck coupling polymerization. These polymers were subsequently applied in enantioselective Michael addition reactions. As the prepared polymers are not soluble in frequently used organic solvents, they act as efficient catalysts in the enantioselective reaction of \u03b2-ketoesters to nitroolefins, achieving up to 99% enantioselectivity with good yields. The insoluble property allows them to better satisfy \u201cgreen chemistry\u201d requirements and be used several times without losing the enantioselectivity.<\/jats:p>","DOI":"10.55730\/1300-0527.3677","type":"journal-article","created":{"date-parts":[[2024,8,23]],"date-time":"2024-08-23T23:25:53Z","timestamp":1724455553000},"page":"512-523","source":"Crossref","is-referenced-by-count":2,"title":["Preparation of a chiral hyperbranched polymer based on cinchona alkaloids and investigation of its catalytic activity in asymmetric reactions"],"prefix":"10.55730","volume":"48","author":[{"given":"RAFIQUL","family":"ISLAM","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"MOHAMMAD SHAHID","family":"ULLAH","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"ABDUS","family":"SALAM","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"SHINICHI","family":"ITSUNO","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"34691","published-online":{"date-parts":[[2024,8,20]]},"container-title":["Turkish Journal of Chemistry"],"original-title":[],"language":"en","deposited":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T12:55:17Z","timestamp":1792587317000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.tubitak.gov.tr\/chem\/vol48\/iss4\/2"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,8,20]]},"references-count":0,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2024,8,20]]}},"URL":"https:\/\/doi.org\/10.55730\/1300-0527.3677","relation":{},"ISSN":["1300-0527"],"issn-type":[{"value":"1300-0527","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,8,20]]}}}