Results 21 to 30 of about 107,424 (195)

Consecutive hydrazino-Ugi-azide reactions: synthesis of acylhydrazines bearing 1,5-disubstituted tetrazoles

Beilstein Journal of Organic Chemistry, 2017
Isocyanide-based multicomponent reactions (IMCRs) allow the construction of relatively complex molecules through a one-pot synthesis. The combination of IMCRs in a consecutive or sequential fashion further extends the complexity of the molecules obtained.
Angélica de Fátima S. Barreto, Veronica Alves dos Santos, Carlos Kleber Z. Andrade   +2 more
doaj   +1 more source

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

Contribuição ao estudo das características físico-químicas e da fração lipídica do leite orgânico. [PDF]

, 2008
Produtos orgânicos consistem em uma alternativa para uma alimentação saudável. Considera-se leite orgânico aquele produzido em sistema no qual é vedado o uso de agrotóxico sintético ou outros insumos artificiais tóxicos e organismos geneticamente ...
Almeida, Keila Emílio de, Fanti, Michele Gabriela Nogueira, Florence, Ana Carolina Rodrigues, Gioielli, Luiz Antônio, Oliveira, Maricê Nogueira de, Rodrigues, Alexandre Mariani, Silva, Roberta Claro da   +6 more
core   +3 more sources

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

Carbohydrate-based 1,3-oxazoline-2-thiones as original bioactive structures:synthesis and reactivity [PDF]

, 2008
Tese de doutoramento, Química (Química Orgânica), 2009, Universidade de Lisboa, Faculdade de CiênciasDisponível no ...
Silva, Sandrina Isabel Ribeiro Martins da, 1980-
core  

Spiro‐Phenothiazine Hole‐Transporting Materials: Unlocking Stability and Scalability in Perovskite Solar Cells

Advanced Materials, EarlyView.
Fluorene‐functionalized spiro‐phenothiazine (PTZ‐Fl) exhibits strong Li+ affinity and thermal stability, enabling a PCE of 25.75% in small‐area cells and 22.07% in 25 cm2 modules. Under ISOS‐L3 conditions, PTZ‐Flbased devices retain over 80% efficiency after 1000 hours, demonstrating superior stability and scalability compared to spiro‐OMeTAD for next ...
Javier Urieta‐Mora, Seung Ju Choi, Jaeki Jeong, Silvia Orecchio, Inés García‐Benito, Manuel Pérez‐Escribano, Joaquín Calbo, Likai Zheng, Minseop Byun, Seyeong Song, Gi‐Hwan Kim, Shaik M. Zakeeruddin, Seog‐Young Yoon, Yimhyun Jo, Agustín Molina‐Ontoria, Enrique Ortí, Nazario Martín, Michael Grätzel   +17 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

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

Experimentos simples com estudantes universitários sobre a compreensão da cinética da reação e a degradação da matéria orgânica [PDF]

, 2013
O artigo destaca a investigação sobre os conceitos da velocidade de reação através da degradação da matéria orgânica realizada com estudantes do curso de Licenciatura em Biologia, mostrando a importância de experimentos simples no aprendizado de química ...
Frazão Teixeira, Ana, Teixeira, Ademar Raimundo Mauro   +1 more
core   +2 more sources