Content:
Texto en español y resumen en inglés ; This section describes our latest results concerning mononuclear tert-butilimido niobium and tantalum (V) compounds. Complexes containing metal-ligand multiple bonds, particularly early transition metal-imido species, constitute an interesting subject because they are implicated as reagents or catalysts in oxidation and metathesis processes. The 1990ºs have witnessed the spectacular development of a new generation of non-metallocene" catalysts, a lot of examples show that this is a scientific area of constant activity.4-8 In recent years, many neutral groups imido complexes have been synthesized,9 although their functionalities were used as ancillary groups10-11 to support high-oxidation state metal centers in some cases. The imido ligand is a reactive group that participates in transformations such as imine and carbodiimide metathesis, imido-to-oxo ligand exchange and the activation C-H bonds in aromatic hydrocarbons.13, 15, 17-19, 223, 237 More recently the synthesis of neutral and cationic imido tantalum compounds and their behavior in migratory insertion reactions with small unsaturated molecules have been reported. In these processes, the resulting [M{C(R)}E] (E = O, NR?
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Dissertation 2013
Language:
Spanish
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