Synthesis and Characterization of Tungsten Alkylidene and Alkylidyne Complexes Supported by a New Pyrrolide-Centered Trianionic ONO3– Pincer-Type Ligand
摘要:
Synthetic protocols for a pyrrolide-centered ONO3- trianionic pincer-type ligand are presented. Treating ((BuO)-Bu-t)(3)W equivalent to(CBu)-Bu-t with the proligand [pyr-ONO]H-3 (2) results in the formation of the trianionic pincer alkylidene complex [pyr-ONO]W=(CHBu)-Bu-t((OBu)-Bu-t) (3). Addition of a mild base to complex 3 provides the trianionic pincer alkylidyne complex {MePPh3}{[pyr-ONO]W equivalent to(CBu)-Bu-t((OBu)-Bu-t)} (4). All new compounds were characterized by NMR spectroscopy, combustion analysis, and, in the case of complex 4, single-crystal X-ray crystallography. D FT calculations performed on 4 provide insight into its electronic structure and indicate that the HOMO is ligand-based and localized on the pyrrolide pi orbitals.
Synthesis and Characterization of Tungsten Alkylidene and Alkylidyne Complexes Supported by a New Pyrrolide-Centered Trianionic ONO3– Pincer-Type Ligand
摘要:
Synthetic protocols for a pyrrolide-centered ONO3- trianionic pincer-type ligand are presented. Treating ((BuO)-Bu-t)(3)W equivalent to(CBu)-Bu-t with the proligand [pyr-ONO]H-3 (2) results in the formation of the trianionic pincer alkylidene complex [pyr-ONO]W=(CHBu)-Bu-t((OBu)-Bu-t) (3). Addition of a mild base to complex 3 provides the trianionic pincer alkylidyne complex {MePPh3}{[pyr-ONO]W equivalent to(CBu)-Bu-t((OBu)-Bu-t)} (4). All new compounds were characterized by NMR spectroscopy, combustion analysis, and, in the case of complex 4, single-crystal X-ray crystallography. D FT calculations performed on 4 provide insight into its electronic structure and indicate that the HOMO is ligand-based and localized on the pyrrolide pi orbitals.
ONO Pincer Ligands and ONO Pincer Ligand Comprising Metal Complexes
申请人:University of Florida Research Foundation, Inc.
公开号:US20170022230A1
公开(公告)日:2017-01-26
Embodiments of the invention are directed to ONO pincer ligands that can be in a trianionic, protonated or protonated equivalent form. The ONO pincer ligand can be combined with a metal comprising compound to form an ONO pincer ligand comprising transition metal complex. By choice of the ONO pincer ligand structure, the steric and electronic properties of the metal complexes therefrom can be controlled. The ONO pincer ligands comprise a central nitrogen atom that is disubstituted with a pair of three atom comprising bridges where the three atoms are a pair of sp
2
hybridized carbons and an sp
3
hybridized carbon.