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A wide range of alkynes and carbonyl electrophiles are tolerated as substrates, providing the propargylic alcohol products in up to 96% yield under metal\u2010free, catalytic conditions. Chiral cinchona alkaloid\u2010derived quaternary ammonium catalysts afforded moderate enantioselectivity (up to 73:27 er). Mechanistic studies with\n                    <jats:italic>p<\/jats:italic>\n                    \u2010substituted aryl alkynes and \u03b1\u2010keto ester electrophiles provided additional evidence for a mechanism that involves the turnover\u2010determining deprotonation to give quaternary ammonium ion \u2013 acetylide ion pairs, which then react with the electrophiles in the chemo\u2010 and enantioselectivity\u2010determining step.\n                  <\/jats:p>","DOI":"10.1002\/chem.71654","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T06:48:01Z","timestamp":1789022881000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Carboxylate\u2013Probase Catalyzed Favorskii Reaction"],"prefix":"10.1002","author":[{"given":"Anton","family":"Bannykh","sequence":"first","affiliation":[{"name":"Department of Chemistry and NanoScience Center University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"},{"name":"Department of Chemistry and Material Science, School of Chemical Engineering Aalto University  Espoo Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-1735-8381","authenticated-orcid":false,"given":"Sanna M.","family":"Stenfors","sequence":"additional","affiliation":[{"name":"Department of Chemistry and NanoScience Center University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0323-3785","authenticated-orcid":false,"given":"Anton","family":"Nechaev","sequence":"additional","affiliation":[{"name":"Department of Chemistry and NanoScience Center University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-3595-0950","authenticated-orcid":false,"given":"John 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