Functionalization of C<inf>n</inf>H<inf>2n+2</inf> Alkanes: Supercritical Carbon Dioxide Enhances the Reactivity towards Primary Carbon-Hydrogen Bonds

Riccardo Gava, Andrea Olmos, Bárbara Noverges, Teresa Varea, Ignacio Funes-Ardoiz, Tomás R. Belderrain, Ana Caballero, Feliu Maseras, Gregorio Asensio, Pedro J. Pérez

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15 Citations (Scopus)

Abstract

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. The functionalization of the primary sites of alkanes is one of the more challenging areas in catalysis. In this context, a novel effect has been discovered that is responsible for an enhancement in the reactivity of the primary C-H bonds of alkanes in a catalytic system. The copper complex Cu(NCMe) (=hydrotris{[3,5-bis(trifluoromethyl)-4-bromo]-pyrazol-1-yl}borate) catalyzes the functionalization of CnH2n+2 with ethyl diazoacetate upon inserting the CHCO2Et unit into C-H bonds. In addition, the selectivity of the reaction toward the primary sites significantly increased relative to that obtained in neat alkane upon using supercritical carbon dioxide as the reaction medium. This was attributed to the effect of the carbon dioxide molecules that withdraw electron density from the fluorine atoms of the ligand, which enhances the electrophilic nature of the metal center. DFT studies validated this proposal.
Original languageEnglish
Pages (from-to)3254-3260
JournalChemCatChem
Volume7
Issue number20
DOIs
Publication statusPublished - 1 Oct 2015

Keywords

  • C-H activation
  • carbene transfer
  • copper
  • silver
  • supercritical fluids

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