Results 11 to 20 of about 12,051 (164)
Química orgânica para o ensino médio: uma abordagem inovadora [PDF]
, 2022 The book deals with the content of Chemistry of the third year of High School (SED/MS), specifically Organic Chemistry. The material proposes an approach that prominently contemplates the properties of substances and not just the simple memorization of
Garcez, Walmir Silva +1 more
core
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
doaj +1 more source
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
doaj +1 more source
Light and Dark Cycles Control the Structural Evolution of Photoresponsive Supramolecular Systems
Angewandte Chemie, EarlyView.Here, we report a photoswitchable synthetic peptide that, under light energy cycles, exhibits supramolecular polymorphism coupled to darkness‐driven structural self‐selection. We demonstrate that light sustains a transient assembled state in the form of helical nanoribbons, hindering the system from undergoing a transition to the disassembled state ...
Alejandro Méndez‐Ardoy +6 more
wiley +2 more sources
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