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Undirected C-H Bond Activation in Aluminium Hydrido Enaminonates.

ABSTRACT: Two new aluminium hydrido complexes were synthesized by reacting AlH3 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)2] (3) 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] (4a), 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 (1H,1H NOESY, 13C, 19F, and 27Al NMR).

SUBMITTER: Amadi CK 

PROVIDER: S-EPMC10004653 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature

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Undirected C-H Bond Activation in Aluminium Hydrido Enaminonates.

Amadi Chijioke Kingsley CK   Atamtürk Ufuk U   Lichtenberg Andreas A   Raauf Aida A   Mathur Sanjay S  

Molecules (Basel, Switzerland) 20230224 5

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-coord  ...[more]

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