| Texto completo | |
| Autor(es): |
Silva, Rodrigo C.
;
Villela, Lucas F.
;
Brocksom, Timothy J.
;
de Oliveira, Kleber T.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | RSC ADVANCES; v. 10, n. 52, p. 8-pg., 2020-08-25. |
| Resumo | |
In this study, direct C-H photoarylation of pyrazine with aryldiazonium salts under visible-light irradiation (blue-LEDs) is described, and additional examples including photoarylations of pyrimidine and pyridazine are also covered. The corresponding aryl-diazines were prepared in yields up to 84% only by mixing and irradiating the reaction with no need for an additional photocatalyst. We demonstrate the efficacy of this protocol by the scope with electron-donor, -neutral, and -withdrawing groups attached at theortho,meta, andparapositions of the aryldiazonium salts; the results are better than those reported for ruthenium-complex mediated photoarylations. Additionally, we demonstrate the robustness of this methodology with a 5 mmol scaled-up experiment. Mechanistic studies were carried out giving support to the proposal of a photocatalyzed approach by an electron donor-acceptor (EDA) complex, also highlighting the crucial role that solvents play in the formation of the EDA complex. (AU) | |
| Processo FAPESP: | 18/00106-7 - Reações Fotocatalisadas por Porfirinas em Condições de Fluxo Contínuo: Arilação de Sistemas Heterocíclicos e de Olefinas Ativadas |
| Beneficiário: | Kleber Thiago de Oliveira |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 18/00879-6 - Reações de Arilação de Heterociclos Fotocatalisadas por Porfirinas em Condições de Batelada e em Regime de Fluxo Contínuo |
| Beneficiário: | Rodrigo Costa e Silva |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica |
| Beneficiário: | Vanderlei Salvador Bagnato |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |