A Well-Defined Pd Hybrid Material for the Z-Selective Semihydrogenation of Alkynes Characterized at the Molecular Level by DNP SENS (pages 12234–12238)
Dr. Matthew P. Conley, Ruben M. Drost, Dr. Mathieu Baffert, Dr. David Gajan, Prof. Dr. Cornelis Elsevier, Dr. W. Trent Franks, Prof. Dr. Hartmut Oschkinat, Laurent Veyre, Alexandre Zagdoun, Dr. Aaron Rossini, Dr. Moreno Lelli, Dr. Anne Lesage, Dr. Gilles Casano, Dr. Olivier Ouari, Prof. Dr. Paul Tordo, Prof. Dr. Lyndon Emsley, Prof. Dr. Christophe Copéret and Dr. Chloé Thieuleux
Article first published online: 19 AUG 2013 | DOI: 10.1002/chem.201302484
Direct evidence of the conformation of a Pd–N heterocyclic carbene (NHC) moiety imbedded in a hybrid material and of the Pd–NHC bond were obtained by dynamic nuclear polarization surface-enhanced NMR spectroscopy (DNP SENS) at natural abundance in short experimental times (hours). Overall, this silica-based hybrid material containing well-defined Pd–NHC sites in a uniform environment displays high activity and selectivity in the semihydrogenation of alkynes into Z-alkenes (see figure).