Nikolai S. Bushkov, Andrey V. Rumyantsev, Andrey V. Pichugov, Anton A. Zhizhin, Dmitry Yu. Aleshin, Evgenii I. Gutsul, Rina U. Takazova, Dinara Kh. Kitaeva, Fedor M. Dolgushin, Roman A. Novikov, Pavel A. Zhizhko, Dmitry N. Zarubin
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Abstract
We report here the preparation and characterization of new well-defined silica-supported Ti imido complexes that present an L-ligand variation in a structure of currently the most active oxo/imido heterometathesis catalyst (≡SiO)Ti(=NtBu)(Me2Pyr)(py)2 (1s), where py is replaced with stronger electron-donating 4-(N,N-dimethylamino)pyridine (2s) or bidentate 2,2′-bipyridine (3s). The materials were characterized with elemental and mass balance analyses and IR and solid-state NMR that confirmed the selective formation of surface Ti species with terminal imido ligand. Evaluation of the catalytic oxo/imido heterometathesis activity of the obtained materials demonstrated that L-ligands have a pronounced influence on the catalytic performance. In particular, the replacement of pyridine with stronger donating ligands resulted in a significant drop of activity. The catalytic results are discussed in view of the reaction mechanism and implications for further catalyst development.
期刊介绍：
All new compounds should be satisfactorily identified and proof of their structure given according to generally accepted standards. Structural reports, such as papers exclusively dealing with synthesis and characterization, analytical techniques, or X-ray diffraction studies of metal-organic or organometallic compounds will not be considered. The editors reserve the right to refuse without peer review any manuscript that does not comply with the aims and scope of the journal. Applied Organometallic Chemistry publishes Full Papers, Reviews, Mini Reviews and Communications of scientific research in all areas of organometallic and metal-organic chemistry involving main group metals, transition metals, lanthanides and actinides. All contributions should contain an explicit application of novel compounds, for instance in materials science, nano science, catalysis, chemical vapour deposition, metal-mediated organic synthesis, polymers, bio-organometallics, metallo-therapy, metallo-diagnostics and medicine. Reviews of books covering aspects of the fields of focus are also published.
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