Results 11 to 20 of about 108,024 (198)
Chemical Constituents and Insecticidal Activity of (Annonaceae)
Natural Product Communications, 2008 The present work describes the isolation of dehydrodiscretamine, discretamine, liriodenine, lichexanthone, molvizarin, rolliniastatin-1, annonacin and bullatacin from roots of Rollinia leptopetala R E Fries. The structures were established after analysis
Ângela M.C. Arriaga +9 more
doaj +1 more source
Molbank, 2021 A novel curcumin analog namely 2-chloro-4,6-bis{(E)-3-methoxy-4-[(4-methoxybenzyl)oxy]-styryl}pyrimidine (compound 7) was synthesized by three-step reaction. The condensation reaction of protected vanillin with 2-chloro-4,6-dimethylpyrimidine (6) was the
Otávio Augusto Chaves +5 more
doaj +1 more source
A simple and efficient process for the extraction of naringin from grapefruit peel waste
Green Processing and Synthesis, 2018 An improved method to obtain naringin, a bitter flavored flavanone glicoside with proven biological activities, from grapefruit (Citrus x paradisi L.) peel waste is described. The proposed modification of the known process, which involves extraction with
Victor Mauricio M. +4 more
doaj +1 more source
Brazilian contributions to alcohol dehydrogenases-catalyzed reactions throughout the 21st century
Results in Chemistry, 2022 Biocatalysis is well-established in (bio)chemical sciences and Brazil has significantly contributed to the growth of this theme. In this context, herein we have compiled the advances in alcohol dehydrogenases-catalyzed biotransformations in the last two ...
Jullyane da Silva de Oliveira Gomes +4 more
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π‐Enlargement in Porphyrin Macrocycles at Interfaces
Angewandte Chemie, EarlyView.On‐surface synthesis of a 20‐π free‐base expanded porphyrin, by depositing onto a hot Ag(111) substrate an 18‐π free‐base precursor equipped with ‐CF3 functional groups ABSTRACT Porphyrins are essential heteroatomic macrocycles, fundamental to both biological systems and advanced technology.
Ana Barragán +11 more
wiley +2 more sources
1,2-Naphthoquinone-4-sulfonic acid salts in organic synthesis
Beilstein Journal of Organic Chemistry, 2022 Several low molecular weight naphthoquinones are very useful in organic synthesis. These compounds have given rise to thousands of other naphthoquinones that have been tested against various microorganisms and pharmacological targets, including being ...
Ruan Carlos B. Ribeiro +5 more
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Nematicidal Activity of the Essential Oils from (Rutaceae) Samples
Natural Product Communications, 2006 The composition and nematicidal activity of the essential oils from the leaves of native and six cultivated varieties of P. microphyllus are reported. Twenty-nine compounds were identified (86.2% sesquiterpenes and 13.8% aliphatic ketones) of which (E ...
Nirla R. Romero +9 more
doaj +1 more source
Synthesis of platinum and palladium complexes with bis-(hydroxy imines)
Orbital: The Electronic Journal of Chemistry, 2012 The Schiff bases are an important class of compounds well used as ligands in coordination chemistry. The functionalized bis-imines, that represent a specific group of Schiff base, have been studied in our research group both for the evaluation of ...
Lucas M. Arantes +2 more
doaj +1 more source
Concept mapping as a tool to break disciplinary boundaries: isomerism in biological systems [PDF]
, 2008 O mapeamento conceitual foi utilizado como uma ferramenta para verificar as mudanças conceituais de estudantes de Ensino Médio após a realização de atividades didáticas desenvolvidas durante as aulas de Química.
CORREIA, Paulo Rogério Miranda +2 more
core +2 more sources
One-pot preparation of substituted pyrroles from α-diazocarbonyl compounds
Beilstein Journal of Organic Chemistry, 2008 In this work an efficient one-pot synthesis of substituted pyrroles 7a–n is described, which involves the in situ formation of dihydrofurans ethyl 5-butoxy-2-methyl-4,5-dihydrofuran-3-carboxylate (4), 1-(5-butoxy-2-methyl-4,5-dihydrofuran-3-yl)ethanone ...
Fernando de C. da Silva +5 more
doaj +1 more source