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Commun."],"abstract":"<jats:p>\n                    We introduce 2,4,6-tri-\n                    <jats:italic>tert<\/jats:italic>\n                    -butylpyrimidinium B(Ar\n                    <jats:sup>F<\/jats:sup>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    as a stable, crystalline organocatalyst for direct esterification of equimolar carboxylic acids and alcohols under mild conditions.\n                  <\/jats:p>","DOI":"10.1039\/d6cc04457c","type":"journal-article","created":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T10:05:26Z","timestamp":1789466726000},"page":"20141-20144","update-policy":"https:\/\/doi.org\/10.1039\/rsc_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Umpolung reactivity in the direct esterification of carboxylic acids and alcohols catalyzed by sterically hindered and electron-deficient tri-\n                    <i>tert<\/i>\n                    -butylpyrimidinium B(Ar\n                    <sup>F<\/sup>\n                    )\n                    <sub>4<\/sub>"],"prefix":"10.1039","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-7351-8150","authenticated-orcid":false,"given":"Mahendra K. 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