Results 51 to 60 of about 182,970 (169)

Constituintes químicos isolados dos caules de Michelia champaca L. (Magnoliaceae)

Eclética Química, 2018
O fracionamento cromatográfico da fase diclorometânica dos caules de Michelia champaca, forneceu quatro substâncias: álcool 4-O-β-D-glicopiranosídeo sinapílico, aldeído 4-O-β-D-glicopiranosídeo sinápico, siringaresinol e N-acetilnonaina.
Maisa Cristina Morais Monteiro, I. H. Leptokarydis, Geraldo H. Silva, Vanderlan S Bolzani, Viviane Cândida da Silva, Maria Cláudia Marx Young, M. N. Lopes   +6 more
doaj   +1 more source

Chemsketch: Un recurso didáctico para el aprendizaje de Química Orgánica en estudiantes de Bachillerato

UNIANDES Episteme
Actualmente, el estudio de la química se percibe como una ciencia árida, dogmática y difícil, exacerbada aún por metodologías tradicionales. Para revertir esta tendencia, es esencial incorporar recursos digitales para facilitar la comprensión y el ...
Luis Orlando Chonillo Sislema
semanticscholar   +1 more source

Produção de vídeos no Ensino de Bioquímica e Química Orgânica

, 2020
As Tecnologias Digitais estao cada vez mais presentes no ambiente escolar. Utilizar essas tecnologias como aliadas no processo de ensino-aprendizagem pode ser uma estrategia para aumentar o interesse e a adesao dos estudantes para o estudo da quimica.
Vagner Darlane Fortes Rosado, C. O. Felcher, A. Salgueiro, V. Folmer   +3 more
semanticscholar   +1 more source

A Cu‐Based Near‐IR Active MOF with an Ion‐Pair Guest Exhibiting Versatile and Selective Gas‐Solid Reactivity

Advanced Materials, EarlyView.
The new Cu‐containing MOF (Me2NH2)(CuICl2)@[Cu4(INA)4Cl2O]·1.5dmf (3) contains a cation and an anion as guests and shows UV‐near‐mid‐IR absorption and near‐IR emission. MOF 3 shows gas‐solid reactivity in the presence of NH3 and HCOOH to yield two new 3D MOF.
Rajat Saha, Alejandro Cortés‐Villena, Silvia Gómez‐Coca, Alberto Fernández‐Alarcón, Joaquín Calbo, Raquel E. Galian, Enrique Ortí, Eliseo Ruiz, Mónica Giménez‐Marqués, Samia Benmansour, Carlos J. Gómez‐García   +10 more
wiley   +1 more source

Synthesis of acylhydrazino-peptomers, a new class of peptidomimetics, by consecutive Ugi and hydrazino-Ugi reactions

Beilstein Journal of Organic Chemistry, 2016
Herein we describe a versatile approach for the synthesis of acylhydrazino-peptomers, a new class of peptidomimetics. The key idea in this approach is based on a simple route using a one-pot hydrazino-Ugi four-component reaction followed by a ...
Angélica de Fátima S. Barreto, Veronica Alves dos Santos, Carlos Kleber Z. Andrade   +2 more
doaj   +1 more source

AS CHALCONAS NO ENSINO DA QUÍMICA ORGÂNICA EXPERIMENTAL NO CONTEXTO DA QUÍMICA VERDE

Química Nova
CHALCONES IN TEACHING EXPERIMENTAL ORGANIC CHEMISTRY IN THE CONTEXT OF GREEN CHEMISTRY. The article presents the importance of practice in teaching Organic Chemistry in higher education, in addition to doing it following the methods of Green Chemistry ...
M. Carlos, A. Echevarria
semanticscholar   +1 more source

Continuous‐Flow Microfluidic Synthesis Enhances C2+ Selectivity for Cu2O Catalysts

Advanced Science, EarlyView.
Microfluidic devices are used to prepare Cu2O nanoparticles under laminar flow conditions, which exhibit enhanced selectivity in the CO2‐to‐C2+ reaction due to their nanoporosity and high defect concentration. Cu2O prepared using standard solution methods displays decreased CO2‐to‐C2+ selectivity due to the absence of similar properties. Altogether, we
Carlota Casas, Anh Tuan Ngo, João Pedro Vale, Ona Falcó, Gerard Martí, Mohamed Amazian, Júlia Mayans, Sònia Estradé, Marcos Gil‐Sepulcre, Teresa Andreu, Francesca Peiró, Tiago Sotto Mayor, Lluís Yedra, Jordi García‐Antón, Josep Puigmartí‐Luis, Xavier Sala, Roc Matheu   +16 more
wiley   +1 more source

Investigative and collaborative experimental activities using simple purification of curcuminoids by column chromatography

Educación Química
This work describes the use of turmeric in the teaching concepts and laboratory techniques of organic chemistry to students in introductory classes of licentiate, bachelor’s and industrial chemistry courses, as well as to pharmacy and chemical ...
Alessandra Leda Valverde, Lucas Silva Abreu, Carlos Magno Rocha Ribeiro   +2 more
doaj   +1 more source

A new and efficient procedure for the synthesis of hexahydropyrimidine-fused 1,4-naphthoquinones

Beilstein Journal of Organic Chemistry, 2015
A new and efficient method for the synthesis of hexahydropyrimidine-fused 1,4-naphthoquinones in one step with high yields from the reaction of lawsone with 1,3,5-triazinanes was developed.
Marcelo Isidoro P. Reis, Vinícius R. Campos, Jackson A. L. C. Resende, Fernando C. Silva, Vitor F. Ferreira   +4 more
doaj   +1 more source

ANÁLISE CONFORMACIONAL DE COMPOSTOS DE BIGINELLI COM ATIVIDADE ANTINEOPLÁSICA

Eclética Química, 2018
Dihydropyrimidinones, such as monastrol and analogues, are heterocycles with known antineoplastic activity. Conformational  analysis represents an important preliminary step in structure-activity correlation studies. Herein we describe the conformational
Marcelo Volpatto Marques, Denis Russowsky, L. M. A. Fontoura   +2 more
doaj   +1 more source