João Rufino de Freitas Filho, Jucleiton José Rufino de Freitas, Juliano Carlo Rufino de Freitas, Mônica Freire Belian, Claudio Augusto Gomes da Camara, Pedro Ramos de Souza Neto, Alécia Regina Andresa Silva, Alex Sandro Nascimento da Silva Filho, Alice Mariana Souza de Almeida, Jonatas Tavares da Silva, Mirian Luzinete da Silva, Anne Gabrielle Marques da Silva, Marcílio Martins de Moraes, Clécio Souza Ramos & Ronaldo Nascimento de Oliveira·International Research Journal of Pure and Applied Chemistry·2024
Determination of the stereochemistry of the stereocenter from the aglyconic part of carbohydrates is always one of the most important tasks for chemistry carbohydrates researchers. The absolute configuration (AC), a challenge for synthetic chemists, has attracted much attention....
Open access
Research Article10.9734/irjpac/2024/v25i1843
João Rufino de Freitas Filho, Jucleiton José Rufino de Freitas, Pedro Ramos de Souza Neto, Fabrícia Aparecida Marques de Souza, Adiel Soares Ferreira, Anne Gabrielle Marques da Silva, Francisco Antonio Mabson Henrique Lopes, Marcílio Martins de Moraes, Clécio Souza Ramos & Ronaldo Nascimentos de Oliveira·International Research Journal of Pure and Applied Chemistry·2023
The anomeric effect in carbohydrate chemistry is known as the interaction between the OHd substituent at the anomeric position to favor an axial orientation rather than an equatorial one, despite the increased 1,3-diaxial interactions. In the anomeric effect, a sugar ring is stab...
Open access
Research Article10.9734/irjpac/2023/v24i5830
João Rufino de Freitas Filho, Jucleiton José Rufino de Freitas, Juliano Carlo Rufino de Freitas, Clécio de Souza Ramos, Fabrícia Aparecida Marques de Souza, Jaqueline Ferreira Ramos, Ricarte Tavares & Drielly Emanoele Tomé Barros de Oliveira·International Research Journal of Pure and Applied Chemistry·2023
Oxadiazoles are heterocyclic compounds that belong azole class which contain two nitrogen atoms and one oxygen, forming a five-membered heterocyclic ring. Four isomers of oxadiazoles are described in the literature. Among these, 1,2,4-oxadiazole, 1,2,5-oxadiazole, and 1,3,4-oxadi...
Open access
Research Article10.9734/irjpac/2023/v24i1798
João Rufino de Freitas Filho, Jucleiton José Rufino de Freitas, Juliano Carlo Rufino Freitas, Aldicéia Luiz de Moura, Mauricélia Maria de Sousa Mata, André Ricardo França da Silva, Maria Verônica de Sales Barbosa & Jaqueline Ferreira Ramos·International Research Journal of Pure and Applied Chemistry·2021
The present study aimed to synthesis and characterization of 3-aryl-5-hydroxyalkyl-1,2,4-oxadiazoles (5a-d, 6a-d, 7a/d, 8a-d and 9a-c). The 3-aryl-5-hydroxyalkyl-1,2,4-oxadiazoles were synthesized by treatment of arylamidoxime 1a-d with a-hydroxy esters for 4 hours without any so...
Open access
Research Article10.9734/irjpac/2021/v22i1130446
Gustavo Neto Bandeira, Claudio Augusto Gomes da Camara, Marcílio Martins de Moraes, João Paulo Ramos de Melo, João Rufino de Freitas Filho & Jucleiton José Rufino de Freitas·Archives of Current Research International·2025
The diamondback moth (Plutella xylostella) is a cosmopolitan pest known for its destruction of cruciferous plants. Commercial insecticides, such as Decis 25 EC and Azamax, are the main forms of controlling this pest in irrigated systems in the agricultural communities of the city...
Open access
Research Article10.9734/acri/2025/v25i11058