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Undirected C-H Bond Activation in Aluminium Hydrido Enaminonates
oleh: Chijioke Kingsley Amadi, Ufuk Atamtürk, Andreas Lichtenberg, Aida Raauf, Sanjay Mathur
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2023-02-01 |
Deskripsi
Two new aluminium hydrido complexes were synthesized by reacting AlH<sub>3</sub> with the enaminone ligand N-(4,4,4-trifluorobut-1-en-3-on)-6,6,6-trifluoroethylamine (HTFB-TFEA) in different molar ratios to obtain mono- and di-hydrido-aluminium enaminonates. Both air and moisture sensitive compounds could be purified via sublimation under reduced pressure. The spectroscopic analysis and structural motif of the monohydrido compound [H-Al(TFB-TBA)<sub>2</sub>] (<b>3</b>) showed a monomeric 5-coordinated Al(III) centre bearing two chelating enaminone units and a terminal hydride ligand. However, the dihydrido compound exhibited a rapid C-H bond activation and C-C bond formation in the resulting compound [(Al-TFB-TBA)-HCH2] (<b>4a</b>), which was confirmed by single crystal structural data. The intramolecular hydride shift involving the migration of a hydride ligand from aluminium centre to the alkenyl carbon of the enaminone ligand was probed and verified by multi-nuclear spectral studies (<sup>1</sup>H,<sup>1</sup>H NOESY, 13C, <sup>19</sup>F, and <sup>27</sup>Al NMR).