International Journal of Chemical Studies
Vol. 5, Issue 2 (2017)
Aromatic ketone as chelating ligand in trimethylphosphine complexes of cobalt through cyclometalation reactions and C-H activation
Author(s): Hamdi AM Bennour
Abstract: Cyclometalation transform barely activated or non-activated C-H bonds of coordinated ligands into C–metal bonds. Metallacyclic species are known for almost all transition elements, and the majority of them contain five-membered rings. [1, 2] Since the desicive breakthrough by Murai et al., who achieved a highly efficient ruthenium-catalyzed addition of aromatic C-H bonds to unsaturated substrates this reaction is recognized as a new category of chemistry. The compounds which were synthesized and presented in this work serve as stable models of reactive intermediate. Benzophenone and benzylphenylketone reacts smoothly under mild conditions with CoMe (PMe3)4 by elimination of methane to afford five-membered metallacycles compounds 1, 2 respectively. Iodomethane reactions with compound 1 form iodo-cobalt (III) complex 3 through oxidative addition reaction. 2,3,4,5,6-pentafluorobenzophenone react with Co(I) educts by elimination of methane and C-F activation to afford penta coordinate Co(I), complex 4. All complexes 1-4 obtained were characterized by spectroscopy IR, NMR and their X-ray diffraction was discussed.
Pages: 97-102 | 1389 Views 22 Downloads
How to cite this article:
Hamdi AM Bennour. Aromatic ketone as chelating ligand in trimethylphosphine complexes of cobalt through cyclometalation reactions and C-H activation. Int J Chem Stud 2017;5(2):97-102.