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With high regioselectivity, 100\u2009% atom economy, and convenient product isolation, this heterogeneously catalyzed version of the Dorn cycloaddition corresponds to click\u2010chemistry criteria.<jats:boxed-text content-type=\"graphic\" position=\"anchor\"><jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mimetype=\"image\/gif\" position=\"anchor\" specific-use=\"enlarged-web-image\" xlink:href=\"graphic\/mcontent.gif\"><jats:alt-text>magnified image<\/jats:alt-text><\/jats:graphic><\/jats:boxed-text><\/jats:p><jats:p>Copper(I)\u2010exchanged zeolites were used as heterogeneous ligand\u2010free catalysts for [3+2] cycloaddition of azomethine ylides, which allows versatile, efficient, and highly regioselective synthesis of pyrazolone derivatives. These cheap and easy\u2010to\u2010prepare catalysts exhibit wide scope and compatibility with functional groups. They are very simple to use, easy to remove (by simple filtration), and recyclable (up to six times without loss of activity).<\/jats:p>","DOI":"10.1002\/chem.200802191","type":"journal-article","created":{"date-parts":[[2009,2,3]],"date-time":"2009-02-03T03:51:21Z","timestamp":1233633081000},"page":"2810-2817","source":"Crossref","is-referenced-by-count":108,"title":["Copper(I) Zeolites as Heterogeneous and Ligand\u2010Free Catalysts: [3+2] Cycloaddition of Azomethine Imines"],"prefix":"10.1002","volume":"15","author":[{"given":"Murielle","family":"Keller","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdelkarim\u2005Sani\u2005Souna","family":"Sido","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Pale","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jean","family":"Sommer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2009,2,26]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/352760183X"},{"key":"e_1_2_6_3_2","first-page":"75","volume":"80","author":"Varvounis G.","year":"2001","journal-title":"Adv. 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