Buscar
Mostrando ítems 11-20 de 476
Experimental Analyses Emphasize the Stability of the Meisenheimer Complex in a S N Ar Reaction Toward Trends in Reaction Pathways
(2020-07)
The mechanism of SNAr reactions between 2-chloro-5-nitropyrimidine with primary and secondary alicyclic amines, respectively, have been studied by kinetic measurements. The kinetic data obtained in aqueous media opens a ...
Controle da relação de sítios ácidos de Lewis e Brønsted pela incorporação de Sn em zeólitas Y - efeito na seletividade a produtos durante a conversão one-pot de furfural
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Engenharia Química - PPGEQCâmpus São Carlos, 2021-02-25)
In the last years, in the production of chemicals or intermediates, the use of bioderived feedstocks as alternative sources to those derived from fossil fuels, has progressively increased. In this context, the conversion ...
Produção de γ-valerolactona a partir de furfural sobre zeólitas Hf/Al-beta – efeito da relação de sítios ácidos de Lewis e Brønsted
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Engenharia Química - PPGEQCâmpus São Carlos, 2020-03-19)
Lignocellulosic biomass has been used as a sustainable alternative to organic derivatives of fossil origin for the production of intermediates and chemicals with higher added value. In this context, γ-valerolactone (GVL), ...
Avaliação do potencial eletrofílico de azalactonas frente à nucleófilos, via catálise por ácido de Brønsted
(Universidade Federal de Juiz de Fora (UFJF)BrasilICE – Instituto de Ciências ExatasPrograma de Pós-graduação em QuímicaUFJF, 2017)
Influence of the Brønsted acidity, SiO2/Al2O3 ratio and Rh-Pd content on the ring opening. Part II. Selective ring opening of methylcyclohexane
(Elsevier, 2014-01)
Monometallic and bimetallic Pd-Rh catalysts with various Rh/Pd atomic ratios (=0.5, 1 and 2) and a total metal charge of 1 wt% supported on SiO2-Al2O3(SIRAL 40, 20, 5) were studied for the ring opening of methylcyclohexane ...
Singlet oxygen formation in NaO2 battery cathodes catalyzed by ammonium Brönsted acid
(Elsevier Science, 2020-09-01)
The presence of singlet oxygen in metal-O2 batteries is one of the major factors responsible for the degradation of the electrolyte. The formation of singlet oxygen, 1O2, at Na–O2 cathodes in sodium trifluoromethane sulfonate ...
Bronsted acid catalyzed azlactone ring opening by nucleophiles
(Pergamon-elsevier Science LtdOxfordInglaterra, 2014)