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oai:uvadoc.uva.es:10324/217422025-02-03T09:36:29Zcom_10324_1186com_10324_931com_10324_894com_10324_28542com_10324_952col_10324_1404col_10324_28543

N-Heterocyclic Carbenes Supported on Vinylic Addition Polynorbornene: A Recyclable and Recoverable Organocatalyst Molina de la Torre, Jesús Angel Albéniz Jiménez, Ana Carmen Chemistry Catalysts A bromoalkyl functionalized vinylic addition polynorbornene has been used as an inert new scaffold to support imidazolium salts by straightforward nucleophilic substitution using different imidazoles ImR (R=Me, mesityl, 2,6-iPr2C6H3). These polymers, VA-PNB-(CH2)4ImRBr, are precursors of N-heterocyclic carbenes which are useful as heterogeneous organocatalysts. The polymeric carbenes have been tested in two model reactions: The synthesis of saturated esters from α,β-unsaturated aldehydes and the conjugate umpolung reaction of α,β-unsaturated aldehydes for the synthesis of γ-butyrolactones. The supported catalyst (R=mesityl) is fully recyclable and can be recovered as an imidazolium salt and stored for further use. 2016-12-14T19:38:26Z 2016-12-14T19:38:26Z 2016-12-14T19:38:26Z 2014 info:eu-repo/semantics/article ChemCatChem, 2014, Volume 6, Issue 12, p. 3547–3552 1867-3880 http://uvadoc.uva.es/handle/10324/21742 10.1002/cctc.201402767 12 ChemCatChem 6 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 International Wiley