Publicação: New dmso-ruthenium catalysts bearing N-heterocyclic carbene ligands for the ring-opening metathesis of norbornene
dc.contributor.author | Cruz, Thais R. [UNESP] | |
dc.contributor.author | Silva, Rodolpho A. N. [UNESP] | |
dc.contributor.author | Machado, Antonio E. H. | |
dc.contributor.author | Lima-Neto, Benedito S. | |
dc.contributor.author | Goi, Beatriz E. [UNESP] | |
dc.contributor.author | P. Carvalho, Valdemiro [UNESP] | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.contributor.institution | Universidade Federal de Uberlândia (UFU) | |
dc.contributor.institution | Universidade de São Paulo (USP) | |
dc.date.accessioned | 2019-10-06T15:40:10Z | |
dc.date.available | 2019-10-06T15:40:10Z | |
dc.date.issued | 2019-01-01 | |
dc.description.abstract | Novel dimethyl sulfoxide ruthenium(ii) complexes of N-heterocyclic carbenes [RuCl2(S-dmso)2(SIMes)] (1), [RuCl2(S-dmso)2(IMes)], (2) [RuCl2(S-dmso)2(SIDip)] (3), and [RuCl2(S-dmso)2(IDip)] (4) were successfully synthesized. The complexes 1-4 were characterized by elemental analysis, FTIR, UV-Vis, 1H and 13C NMR, and computational studies. The polynorbornene (polyNBE) syntheses via ROMP using the complexes 1-4 as pre-catalysts in the presence of ethyl diazoacetate (EDA) were evaluated under different [EDA]/[Ru] and [NBE]/[Ru] ratios, temperatures (25 and 50 °C) and times (5-60 min). Quantitative yields of polyNBEs using [NBE]/[EDA]/[Ru] = 5000/28/1 for 10 min at 25 °C were obtained. The order of magnitude of 105 g mol−1 for Mn and PDI values ranging from 1.2 to 3.5 were measured by SEC. An investigation combining experimental data and computational calculations was performed to elucidate the mechanism of ROMP of NBE mediated by the complexes 1-4 as pre-catalysts. The proposed mechanism suggests the occurrence of a dissociative reaction of the complexes 1-4, losing a dmso ligand as the first step, resulting in a 14-electron species, which reacts with EDA to form the metal-carbene, followed by discoordination of the second dmso molecule for coordination of NBE. | en |
dc.description.affiliation | Faculdade de Ciências e Tecnologia UNESP Univ Estadual Paulista | |
dc.description.affiliation | Instituto de Química Universidade Federal de Uberlândia, P.O. Box 593 | |
dc.description.affiliation | Instituto de Química de São Carlos Universidade de São Paulo, CP 780 | |
dc.description.affiliationUnesp | Faculdade de Ciências e Tecnologia UNESP Univ Estadual Paulista | |
dc.format.extent | 6220-6227 | |
dc.identifier | http://dx.doi.org/10.1039/c9nj00810a | |
dc.identifier.citation | New Journal of Chemistry, v. 43, n. 16, p. 6220-6227, 2019. | |
dc.identifier.doi | 10.1039/c9nj00810a | |
dc.identifier.issn | 1369-9261 | |
dc.identifier.issn | 1144-0546 | |
dc.identifier.scopus | 2-s2.0-85064394201 | |
dc.identifier.uri | http://hdl.handle.net/11449/187560 | |
dc.language.iso | eng | |
dc.relation.ispartof | New Journal of Chemistry | |
dc.rights.accessRights | Acesso restrito | pt |
dc.source | Scopus | |
dc.title | New dmso-ruthenium catalysts bearing N-heterocyclic carbene ligands for the ring-opening metathesis of norbornene | en |
dc.type | Artigo | pt |
dspace.entity.type | Publication | |
unesp.author.lattes | 2452347030723060[5] | |
unesp.author.orcid | 0000-0003-4369-7824[5] | |
unesp.campus | Universidade Estadual Paulista (UNESP), Faculdade de Ciências e Tecnologia, Presidente Prudente | pt |