Dmitry S. Kononovich

Synthesis and structural study of 3-phenyl-6,7,8,9-tetrahydrocyclopenta[ a ]naphthalene-containing ansa -complexes of zirconium

The zirconium rac- and meso-complexes of the ansa-type that contain a 3-phenyl-6,7,8,9-tetrahydrocyclopenta[a]naphthalene fragment and a dimethylsilylene bridge are synthesized. The compounds obtained are characterized by NMR spectroscopy; the structure of rac-complex is studied by X-ray diffraction, which maked it possible to evaluate the steric availability of the zirconium center in the corresponding catalysts for the olefin polymerization.

Coupling of aromatic aldehydes with aryl halides in the presence of nickel catalysts with diazabutadiene ligands

Nickel catalysts with diazabutadiene ligands promote cross-coupling of benzaldehydes with aryl halides in the presence of zinc as reducing agent, which leads to the corresponding benzhydrols and benzophenones. The benzophenone percentage considerably increases when lithium chloride additive is used.

Crystal structures of di-μ-bromido-bis{di­bromido­[η5-2-(di­methyl­amino)­inden­yl]zirconium(IV)} and di­bromido­bis­[η5-2-(di­methyl­amino)­inden­yl]zirconium(IV)

Molecules of di[(μ-bromido)(η5-2-dimethylaminoindenyl)dibromidozirconium(IV)], (I), and bis(η5-2-dimethylaminoindenyl)dibromidozirconium(IV), (II), are dinuclear with one CP ligand and four Br ligands for each of the ZrIV atoms and mononuclear with two CP and two Br ligands for the ZrIV atom, respectively.

Synthesis of 5′,6′,7′,7A′-tetrahydrospiro[cyclohexane-1,4′-inden]-2′(1′ H )-one and 1′,2′,6′,7′-tetrahydrospiro[cyclohexane-1,4′-inden]-3′(5′ H )-one

The paper describes the preparation methods for two tetrahydroindanones of spiro structure.