9 documents found, page 1 of 1
Activity of essential oil of Lippia triplinervis Gardner (Verbenaceae) on Rhipi...
Lage, Tiago Coelho de Assis; Montanari, Ricardo Marques; Fernandes, Sergio Antonio; Monteiro, Caio Márcio de Oliveira; Senra, Tatiane de Oliveira SouzaThe objective of this work was to characterize and investigate the acaricidal activity of the essential oil of the aerial parts of Lippia triplinervis at different concentrations on unengorged larvae and engorged females of Rhipicephalus microplus. The essential oil yielded 2.21 % (w/w to dry matter) and was composed mainly of carvacrol (31.9 %), thymol (30.6 %), and p-cymene (12.3 %). Two tests were performed ...
p-Sulfonic acid calix[n]arenes as homogeneous and recyclable organocatalysts fo...
Fernandes, Sergio Antonio; Natalino, Ricardo; Gazolla, Poliana Aparecida Rodrigues; Silva, Márcio José da; Jham, Gulab NewandramEsterification yields were significantly improved using calix[n]arenes catalysts under simple conditions. p-Sulfonic acid calix[4]arene and p-sulfonic acid calix[6]arene were powerful organocatalysts in several esterification reactions, which showed activity comparable or even superior to other well-established acids catalysts, such as, sulfuric acid, p-toluenesulfonic acid, and p-hydroxybezenesulfonic acid des...
Quinolines: Microwave-assisted synthesis and their antifungal, anticancer and r...
Liberto, Natália Aparecida; Simões, Juliana Baptista; Silva, Sarah de Paiva; Fernandes, Sergio Antonio; Silva, Cristiane Jovelina daAn efficient method for the synthesis of quinolines using microwave irradiation was developed providing 28 quinolines with good yields. The reaction procedures are environmentally friendly, convenient, mild and of easy work-up. Quinolines were evaluated for their antifungal, anticancer and antioxidant properties and exhibited high activities in all tests performed.
β-Cyclodextrin-assisted synthesis of Biginelli adducts under solvent-free condi...
Liberto, Natália Aparecida; Silva, Sarah de Paiva; Fátima, Ângelo de; Fernandes, Sergio AntonioA simple, green and efficient protocol was developed using b -cyclodextrin as a solid catalyst for the solvent-free synthesis of various Biginelli adducts. The advantages of our protocol included the following: (i) a metal-free methodology; (ii) high yields; (iii) simple and efficient work-up procedures; (iv) improved results under solvent-free conditions. b -cyclodextrin-catalyzed the Biginelli reactions for v...
Calix[n]arene-catalyzed three-component povarov reaction: microwave-assisted sy...
Abranches, Paula Aline da Silva; Paiva, Walysson Ferreira de; Fátima, Angelo de; Martins, Felipe Terra; Fernandes, Sergio AntonioA new one-pot cascade reaction-based application of Povarov reactions with a p-sulfonic acid calix[4]arene catalyst for the synthesis of a series of 34 julolidine derivatives with substituents at C8 or C9 in good to excellent yields is reported. These microwave-assisted reactions proceeded efficiently, had short reaction times, were metal-free, were low cost, and used an inexpensive, easily available and nontox...
Organocatalysis in the three-component Povarov reaction and investigation by ma...
Simões, Juliana Baptista; Fátima, Ângelo de; Sabino, Adão Aparecido; Aquino, Francisco José Tôrres de; Silva, Daniel Leite daA diastereoselective three-component cascade reaction, catalyzed by p-sulfonic acid calix[4]arene, provides a unique method to access diverse julolidine derivatives in high yields. Additionally, the reaction was also monitored by mass spectrometry and the mechanistic pathway uncovered.
Proparacaine complexation with β-cyclodextrin and p-sulfonic acid calix[6]arene...
Arantes, Lucas Micquéias; Scarelli, Camilla; Marsaioli, Anita Jocelyne; Paula, Eneida de; Fernandes, Sergio AntonioThis study focused on the use of NMR techniques as a tool for the investigation of complex formation between proparacaine and cyclodextrins (CDs) or p-sulfonic acid calix[6]arene. The pH dependence of the complexation of proparacaine with β-CD and p-sulfonic acid calix[6]arene was studied and binding constants were determined by 1H NMR spectroscopy [diffusion-ordered spectroscopy (DOSY)] for the charged and unc...
Tecnicas de RMN de 1H aplicadas a complexos supramoleculares de calixarenos qui...
Fernandes, Sergio AntonioOrientador: Anita Jocelyne Marsaioli; Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica; Resumo: Esta tese teve como objetivo principal estudar interações intermoleculares empregando a espectroscopia de RMN de H como ferramenta principal. O primeiro capítulo visou "construir" um "hospedeiro quiral" através de interações não covalentes que foi aplicado na discriminação quiral e síntese a...
Aplicação da RMN de 1H para prever regiosseletividade do rearranjo de Claisen a...
Fernandes, Sergio AntonioOrientador : Anita Jocelyne Marsaioli; Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica; Mestrado