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Cyclopentadienyl molybdenum compounds with intramolecular coordination

Authors: Mrózek Ondřej | Honzíček Jan | Vinklárek Jaromír

Year: 2015

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Cyclopentadienyl molybdenum compounds with intramolecular coordination	Cyclopentadienyl compounds of molybdenum have been attracted a long-standing interest due to their potential use as catalysts of number of organic reactions.1 Formal exchange of cyclopentadienyl by indenyl ligand considerably increases rates of substitution reactions. This is a consequence of additional annulated benzene ring at cyclopentadienyl moiety. Such modification of cyclopentadienyl ligand opens new kinetic pathways of substitution reactions by lowering the energetic barrier of the haptotropic shift of the π-ligand. Recently, number of η3-indenyl molybdenum compounds have been stabilized by steric demanding using N,N-chelating ligands.2 In this work, we are focused on stabilization of the η3-indenyl compounds by strong intramolecular coordination. Differences between indenyl compounds and cyclopentadienyl analogous are discussed. Initially, the three derivatives of cyclopentadiene and indene, substituted by picolyl group, were prepared. These precursors were used for preparation of complexes [(η3 C3H5)(η5 Cp')Mo(CO)2], whose allyl ligand can be substituted by intramolecularly coordinated pyridyl. In case of cyclopentadienyl complexes, η5-coordination is kept. Indenyl complexes undergo η5-η3 rearrangement of coordinated π-ligand. It has been further demonstrated that intramolecular coordination of pyridyl as well as hapticity of cyclopentadienyl and indenyl ligands is kept upon the substitution reactions.	indenyl; molybdenum