| Texto completo | |
| Autor(es): |
Martins, Daniele M.
;
Silva, Eliada A.
;
Lima-Neto, Benedito S.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Polyhedron; v. 285, p. 9-pg., 2026-02-01. |
| Resumo | |
The fac-[RuCl2(dmap)(S-dmso)3] complex, where dmap is 4-dimethylaminopyridine, was synthesized in a single step at room temperature and can be stored under ambient conditions without the need for strict exclusion of molecular oxygen or moisture. Kinetic studies of the complex's activity in the ring-opening metathesis polymerization (ROMP) of norbornene, in the presence of ethyl diazoacetate (EDA), were conducted using 1H NMR spectroscopy. The active Ru-carbene species was formed in situ, as confirmed by 1H NMR and mass spectrometry analyses, and initiated the ROMP process immediately. At low monomer concentrations, or in the absence of monomer, isomeric dimers of EDA, diethyl maleate and diethyl fumarate, were produced. A mechanism is proposed for both the homocoupling of EDA and the ROMP reaction, each proceeding via the same Ru-carbene intermediate in a competitive pathway. This study highlights the potential for the straightforward synthesis of low-cost amine-Ru-dmso complexes that function as pre-catalysts in various reactions, with particular emphasis on the use of the dmso molecule as a versatile ancillary ligand. (AU) | |
| Processo FAPESP: | 23/17102-2 - Química sustentável com base na metátese de olefinas: desenvolvimento de olefinas a partir de bio-moléculas via catalisadores economicamente viáveis. |
| Beneficiário: | Benedito dos Santos Lima Neto |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |