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HR\u2010MS, multinuclear (<jats:sup>1<\/jats:sup>H, <jats:sup>13<\/jats:sup>C, and <jats:sup>119<\/jats:sup>Sn) NMR spectroscopy, and FT\u2010IR spectroscopy were used to characterize all compounds (<jats:bold>1<\/jats:bold>\u2013<jats:bold>6<\/jats:bold>). Structural investigation via single\u2010crystal X\u2010ray diffraction confirmed a mononuclear geometry for all compounds, each featuring a five\u2010coordinate tin(IV) center. The Lewis acidity of the compounds (<jats:bold>1<\/jats:bold>\u2013<jats:bold>6<\/jats:bold>) was examined through the Gutmann\u2013Beckett method. The effectiveness of all Sn(IV) compounds (<jats:bold>1<\/jats:bold>\u2013<jats:bold>6<\/jats:bold>) as catalysts for the Knoevenagel condensation of various aldehydes with malononitrile was assessed. In addition, a plausible mechanism is proposed based on the mechanistic studies and theoretical calculations.<\/jats:p>","DOI":"10.1002\/asia.202500767","type":"journal-article","created":{"date-parts":[[2025,8,13]],"date-time":"2025-08-13T19:07:22Z","timestamp":1755112042000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Hypervalent Organotin(IV) Compounds as Efficient Catalysts for the Knoevenagel Condensation of Aldehydes"],"prefix":"10.1002","volume":"20","author":[{"given":"Debayan","family":"Basu","sequence":"first","affiliation":[{"name":"Department of Chemistry &amp; Chemical Biology Indian Institute of Technology (Indian School of Mines) Dhanbad  Dhanbad Jharkhand 826004 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sudipta","family":"Chakraborty","sequence":"additional","affiliation":[{"name":"Department of Chemistry &amp; Chemical Biology Indian Institute of Technology (Indian 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