{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T05:15:51Z","timestamp":1770527751196,"version":"3.49.0"},"reference-count":16,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2008,2,7]],"date-time":"2008-02-07T00:00:00Z","timestamp":1202342400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>2-Acetylcyclopentanone undergoes a smooth reaction with triphenylphosphineand dialkyl acetylenedicarboxylates to produce dialkyl 2-(1-acetyl-2-oxocyclopentyl)-3-(1,1,1-triphenyl-\u03bb5-phosphanylidene)succinates. These compounds undergo intramolecularWittig reactions in boiling benzene to produce highly strained spirocyclobutenederivatives, which spontaneously undergo ring-opening reactions to produce dialkyl (E)-2-[1-(2-oxocyclopentyliden)ethyl]-2-butenedioates.<\/jats:p>","DOI":"10.3390\/molecules13020331","type":"journal-article","created":{"date-parts":[[2008,10,2]],"date-time":"2008-10-02T12:45:09Z","timestamp":1222951509000},"page":"331-339","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["A Facile Route to Diastereomeric Phosphorus Ylides. Chemoselective Synthesis of Dialkyl (E)-2-[1-(2-Oxocyclopentylidene)ethyl]-2-butenedioates"],"prefix":"10.3390","volume":"13","author":[{"given":"Sakineh","family":"Asghari","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Mazandaran, P. O. 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Rev."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1215","DOI":"10.1021\/cr00029a003","article-title":"Low- Coordinate Hyper Valent Phosphorus","volume":"94","author":"Arduago","year":"1994","journal-title":"Chem. Rev."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"11853","DOI":"10.1016\/S0040-4020(99)00671-7","article-title":"Stereoselective Synthesis of Highly Functionalized Cyclobutenes. A Facile Rout to Electron-Deficient 1,3-Dienes","volume":"55","author":"Yavari","year":"1999","journal-title":"Tetrahedron"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Yavari, I., Asghari, S., and Esmaili, A. A. (1999). Vinyltriphenylphosphonium Salt- mediated New Synthesis of\u00a0 Functionalized Maleimides. J. Chem. Res., 234\u2013235.","DOI":"10.1039\/a808978g"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1051","DOI":"10.1016\/S0040-4039(97)10725-0","article-title":"New One-pot Synthesis of tetra-Alkoxycarbonylallylidenetriphenylphos-phoranes","volume":"39","author":"Yavari","year":"1998","journal-title":"Tetrahedron Lett."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2927","DOI":"10.1016\/S0040-4039(02)00435-5","article-title":"An efficient diastereoselective one-pot synthesis of dihydrofuro[2\u2032,3\u2032: 2,3]indeno[2,1-b]furan derivatives","volume":"43","author":"Yavari","year":"2002","journal-title":"Tetrahedron Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1080\/10426500601015716","article-title":"Synthesis of stable phosphorus ylides by the reaction of Ph3P with activated acetylenes in the presence of dimethyl methoxymalonate","volume":"182","author":"Yavari","year":"2007","journal-title":"Phosphorus, Sulfur, Silicon Rel. 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