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A well-defined Pd hybrid material for the Z-selective semihydrogenation of alkynes characterized at the molecular level by DNP SENS.
Matthew P Conley
1 ,
Ruben M Drost ,
Mathieu Baffert ,
David Gajan ,
Cornelis Elsevier ,
W Trent Franks ,
Hartmut Oschkinat ,
Laurent Veyre ,
Alexandre Zagdoun ,
Aaron Rossini ,
Moreno Lelli ,
Anne Lesage ,
Gilles Casano ,
Olivier Ouari ,
Paul Tordo ,
Lyndon Emsley ,
Christophe Copéret ,
Chloé Thieuleux
Sep 09 2013
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Abstract
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).