{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:27:28Z","timestamp":1790123248982,"version":"4.0.1"},"reference-count":28,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2022,7,26]],"date-time":"2022-07-26T00:00:00Z","timestamp":1658793600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"SENAI CIMATEC"},{"name":"PRPPG\/UFVJM"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>SiO2\u2013SO3H, with a surface area of 115 m2\/g and pore volume of 0.38 cm3g\u22121, and 1.32 mmol H+\/g was used as a 20% w\/w catalyst for the preparation of methyl salicylate (wintergreen oil or MS) from acetylsalicylic acid (ASA). A 94% conversion was achieved in a microwave reactor over 40 min at 120 \u00b0C in MeOH. The resulting crude product was purified by flash chromatography. The catalyst could be reused three times.<\/jats:p>","DOI":"10.3390\/molecules27154767","type":"journal-article","created":{"date-parts":[[2022,7,27]],"date-time":"2022-07-27T04:59:16Z","timestamp":1658897956000},"page":"4767","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Tandem Transesterification\u2013Esterification Reactions Using a Hydrophilic Sulfonated Silica Catalyst for the Synthesis of Wintergreen Oil from Acetylsalicylic Acid Promoted by Microwave Irradiation"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0294-5345","authenticated-orcid":false,"given":"Sandro L.","family":"Barbosa","sequence":"first","affiliation":[{"name":"Department of Pharmacy, Universidade Federal dos Vales do Jequitinhonha e Mucuri-UFVJM, Campus JK, Rodovia MGT 367\u2014Km 583, n<sup>o<\/sup> 5.000, Alto da Jacuba, Diamantina 39100-000, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7435-3675","authenticated-orcid":false,"given":"David Lee","family":"Nelson","sequence":"additional","affiliation":[{"name":"Department of Pharmacy, Universidade Federal dos Vales do Jequitinhonha e Mucuri-UFVJM, Campus JK, Rodovia MGT 367\u2014Km 583, n<sup>o<\/sup> 5.000, Alto da Jacuba, Diamantina 39100-000, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Milton de S.","family":"Freitas","sequence":"additional","affiliation":[{"name":"Department of Pharmacy, Universidade Federal dos Vales do Jequitinhonha e Mucuri-UFVJM, Campus JK, Rodovia MGT 367\u2014Km 583, n<sup>o<\/sup> 5.000, Alto da Jacuba, Diamantina 39100-000, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wallans Torres Pio","family":"dos Santos","sequence":"additional","affiliation":[{"name":"Department of Pharmacy, Universidade Federal dos Vales do Jequitinhonha e Mucuri-UFVJM, Campus JK, Rodovia MGT 367\u2014Km 583, n<sup>o<\/sup> 5.000, Alto da Jacuba, Diamantina 39100-000, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stanlei I.","family":"Klein","sequence":"additional","affiliation":[{"name":"Department of General and Inorganic Chemistry, Institute of Chemistry, S\u00e3o Paulo State University-Unesp, R. 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