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New 1,2,4,5-tetrakis-(N-imidazoliniummethyl)benzene and 1,2,4,5-tetrakis-(N-benzimidazoliummethyl)benzene salts as N-heterocyclic tetracarbene precursors: synthesis and involvement in ruthenium-catalyzed allylation reactions |
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| Authors: | Nevin Gü rbü z,Ismail Ö zdemir |
| Affiliation: | a Inönü University, Faculty of Science and Art, Department of Chemistry, 44280 Malatya, Turkey b Ege University, Department of Chemistry, Bornova, 35100 Izmir, Turkey c Université de Rennes, UMR 6226: CNRS—Université de Rennes, Sciences chimiques de Rennes, Catalyse et Organométalliques, Campus de Beaulieu, 35042 Rennes, France |
| Abstract: | New tetraimidazolinium and tetrabenzimidazolium salts have been prepared. Upon reaction with tBuOK, they generate carbene ligands, which were associated in situ to [RuCp*(MeCN)3]PF6 to produce new ruthenium catalysts that are active for the substitution of allylic substrates by amines, phenols, and carbonucleophiles. The influence of the N-heterocyclic core as well as that of the N-substitutents at the periphery of the salts, on reactivity and regioselectivity have been examined. |
| Keywords: | N-Heterocyclic carbene ligand Ruthenium Allylation Homogeneous catalysis |
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