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Intramolecular Cyclization Reactions in Haloalkyl-Cobalt Complexes with Macrocyclic Equatorial Ligands

Renata Dreos   ORCID icon orcid.org/0000-0001-6469-4126 ; Dipartimento di Scienze Chimiche, Università di Trieste, Via L. Giorgieri 1, 34127, Trieste, Italy
Lucio Randaccio ; Dipartimento di Scienze Chimiche, Università di Trieste, Via L. Giorgieri 1, 34127, Trieste, Italy
Patrizia Siega   ORCID icon orcid.org/0000-0003-1700-6380 ; Dipartimento di Scienze Chimiche, Università di Trieste, Via L. Giorgieri 1, 34127, Trieste, Italy
Višnja Vrdoljak   ORCID icon orcid.org/0000-0002-8422-1075 ; Laboratory of General and Inorganic Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia

Puni tekst: engleski, pdf (1 MB) str. 455-461 preuzimanja: 686* citiraj
APA 6th Edition
Dreos, R., Randaccio, L., Siega, P. i Vrdoljak, V. (2009). Intramolecular Cyclization Reactions in Haloalkyl-Cobalt Complexes with Macrocyclic Equatorial Ligands. Croatica Chemica Acta, 82 (2), 455-461. Preuzeto s https://hrcak.srce.hr/39692
MLA 8th Edition
Dreos, Renata, et al. "Intramolecular Cyclization Reactions in Haloalkyl-Cobalt Complexes with Macrocyclic Equatorial Ligands." Croatica Chemica Acta, vol. 82, br. 2, 2009, str. 455-461. https://hrcak.srce.hr/39692. Citirano 10.04.2020.
Chicago 17th Edition
Dreos, Renata, Lucio Randaccio, Patrizia Siega i Višnja Vrdoljak. "Intramolecular Cyclization Reactions in Haloalkyl-Cobalt Complexes with Macrocyclic Equatorial Ligands." Croatica Chemica Acta 82, br. 2 (2009): 455-461. https://hrcak.srce.hr/39692
Harvard
Dreos, R., et al. (2009). 'Intramolecular Cyclization Reactions in Haloalkyl-Cobalt Complexes with Macrocyclic Equatorial Ligands', Croatica Chemica Acta, 82(2), str. 455-461. Preuzeto s: https://hrcak.srce.hr/39692 (Datum pristupa: 10.04.2020.)
Vancouver
Dreos R, Randaccio L, Siega P, Vrdoljak V. Intramolecular Cyclization Reactions in Haloalkyl-Cobalt Complexes with Macrocyclic Equatorial Ligands. Croatica Chemica Acta [Internet]. 2009 [pristupljeno 10.04.2020.];82(2):455-461. Dostupno na: https://hrcak.srce.hr/39692
IEEE
R. Dreos, L. Randaccio, P. Siega i V. Vrdoljak, "Intramolecular Cyclization Reactions in Haloalkyl-Cobalt Complexes with Macrocyclic Equatorial Ligands", Croatica Chemica Acta, vol.82, br. 2, str. 455-461, 2009. [Online]. Dostupno na: https://hrcak.srce.hr/39692. [Citirano: 10.04.2020.]

Sažetak
Organocobalt complexes containing axial haloalkyl groups afford metallacycles of different size by N or O alkylation of the macrocyclic equatorial ligands. The reaction mechanism involves the intra-molecular nucleophilic attack of a negatively charged atom of the equatorial ligand on the axial XCH2 haloalkyl group with simultaneous detachment of a halide ion, X. In imino/oxime and amino/oxime derivatives, the generation of the negatively charged nitrogen requires the abstraction of a proton and the reaction occurs only in alkaline medium. In bis(dimethylglioximato) and Schiff base complexes, a negatively charged oxygen is present in the equatorial ligand and the reaction occurs even in neutral medium. Three-, six- and seven- membered metallacycles are obtained, with the common feature that the Co–C bond is shorter and more resistant toward homolysis than in parent complexes or in closely related derivatives.
Keywords:

Ključne riječi
intramolecular metallacyclization; haloalkyl-cobalt; reaction mechanism; X-ray structures

Hrčak ID: 39692

URI
https://hrcak.srce.hr/39692

Posjeta: 972 *