RT info:eu-repo/semantics/article T1 Brønsted acid−catalyzed synthesis of tetrasubstituted allenes and polysubstituted 2H-chromenes from tertiary propargylic alcohols A1 Cabrera Lobera, Natalia A1 Velasco Pérez, Noelia A1 Sanz Díez, Roberto A1 Fernández Rodríguez, Manuel A. K1 Allenes K1 Brønsted acid catalysis K1 Propargylic alcohols K1 2H-chromenes K1 Nucleophilic substitution K1 Química orgánica K1 Chemistry, Organic AB A practical and environmentally benign Brønsted acid−catalyzed protocol for the preparation of all-carbon tetrasubstituted allenes, consisting in the direct SNˈ addition of tri- or dimethoxy arenes or allyltrimethylsilane to tertiary propargylic alcohols, has been developed. In addition, a straightforward synthesis of densely substituted 2H-chromenes by metal-free tandem allenylation/heterocyclization reaction of methoxyphenols and tertiary alkynols is presented. PB Elsevier SN 0040-4020 YR 2019 FD 2019-08 LK http://hdl.handle.net/10259/5177 UL http://hdl.handle.net/10259/5177 LA eng NO Junta de Castilla y León and FEDER (BU291P18) and Ministerio de Economía y Competitividad (MINECO) and FEDER (CTQ2016-75023-C2-1-P) DS Repositorio Institucional de la Universidad de Burgos RD 28-mar-2024