{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T13:19:54Z","timestamp":1791292794269,"version":"4.1.0"},"reference-count":14,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2009,5,7]],"date-time":"2009-05-07T00:00:00Z","timestamp":1241654400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":["www.mdpi.com"],"crossmark-restriction":true},"short-container-title":["Molecules"],"abstract":"<jats:p>New dissymmetric and asymmetric p-tert-butylthiacalix[4]arene derivatives were prepared as a result of the reaction of p-tert-butylthiacalix[4]arene with diethyl bromomalonate in the presence of different alkali metals (Cs, K and Na) in refluxing acetone for 7 days. The structures of the prepared compounds were investigated by IR, 1H-NMR and MALDI-TOF mass spectroscopy.<\/jats:p>","DOI":"10.3390\/molecules14051755","type":"journal-article","created":{"date-parts":[[2009,5,7]],"date-time":"2009-05-07T11:31:22Z","timestamp":1241695882000},"page":"1755-1761","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["The Reaction of Diethyl Bromomalonate with p-tert-Butylthia-calix[4]arene: An Approach to Asymmetrical Derivatives"],"prefix":"10.3390","volume":"14","author":[{"given":"Omran Abdellah","family":"Omran","sequence":"first","affiliation":[{"name":"Chemistry Department, Sohag University, Sohag, 82524, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2009,5,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Asfari, Z., Bohmer, V., Harrowfield, J., and Vicens, J. (2001). 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