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Among other versatile derivatives of 5\u2010HMF its dimer 5,5\u2032\u2010(oxy\u2010bis (methylene)) bis\u20102\u2010furfural (OBMF) was recognized as a useful building block for the production of polymers and pharmaceuticals. Herein we explored the synthesis of OBMF under solvent free conditions applying vacuum as a green tool for water removal. Several readily available acidic resins, silica gel supported inorganic acid, acidic zeolites and Lewis acids were studied as promoters for this transformation. Under these conditions, SiO<jats:sub>2<\/jats:sub>\/CF<jats:sub>3<\/jats:sub>SO<jats:sub>3<\/jats:sub>H exhibited the best performance allowing the synthesis of OBMF in 55\u2009% yield in only 1\u2005min reaction time. Similar results were achieved using Amberlyst 15 and SO<jats:sub>2<\/jats:sub>\/PPA resulting in 51\u2009% yield in 20\u2005min and 46\u2009% yield in 10\u2005min, respectively.<\/jats:p>","DOI":"10.1002\/cctc.201801560","type":"journal-article","created":{"date-parts":[[2018,11,20]],"date-time":"2018-11-20T08:24:54Z","timestamp":1542702294000},"page":"5406-5409","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Solvent\u2010Free Catalytic Self\u2010Etherification of 5\u2010Hydroxymethyl Furfural"],"prefix":"10.1002","volume":"10","author":[{"given":"Nikolai","family":"Stanev","sequence":"first","affiliation":[{"name":"Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciencies  Acad. G. Bontchev str. Bl. 9 1113 Sofia Bulgaria"}]},{"given":"Jo\u00e3o C. 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