10 documents found, page 1 of 1

UTILIZAÇÃO DE BIOMASSA EM AULAS DE GRADUAÇÃO DE QUÍMICA ORGÂNICA EXPERIMENTAL: ...

This work describes the importance of using renewable sources in experimental classes for undergraduate students, as well as to spread the ideas of using biomass wastes as a source of products of interest. Therefore, in the proposed experiment, citrus fruit peel waste was employed to obtain pure flavonoids by extraction and recristalization. These procedures are important to reveal to students how bioactive pro...

COBRE: PRODUÇÃO INDUSTRIAL E APLICAÇÕES

This article is dedicated to element copper in honor to International Year of the Periodic Table celebrated in 2019. Copper is one of the oldest discovered chemical elements and manipulated by human being. In this sense, aspects about the element copper and its importance in different areas are described, from its mineral exploration through its processing and applications. Inorganic aspects such as structure o...

Biotechnological Properties of Sponges from Northeast Brazil: Cliona varians as...

To research the potential ability of whole marine sponges to act as biocatalysts, this paper describes for the first time the employment of whole Cliona varians sponge in the stereoselective reduction of prochiral a-keto esters and isatin to the corresponding chiral alcohols. The addition of D-fructose, D-glucose or sucrose remarkably increased the conversion ratios and stereoselectivities by this marine sponge...

QUÍMICA ORGÂNICA NO BRASIL: SUA CONTRIBUIÇÃO NA SÍNTESE TOTAL DE PRODUTOS NATUR...

An overview of the achivements in the field of the total synthesis of natural products in Brazil in the last 40 years is presented. These contributions are described on different classes of natural products since the birth of Brazilian Chemical Society in 1977. It was intended to create a brief review showing the evolution and current state of the art of Organic Chemistry in Brazil, registering growth and matur...

Synthesis and Evaluation of Cytotoxic Effects of Amino-ester Derivatives of Nat...

Natural α,β-amyrins were isolated from endemic Brazilian Esenbeckia grandiflora Mart., and eight synthetic derivatives were obtained by esterification reactions with bromo acetate, followed by amine treatment. The structures of the all compounds were confirmed by 1H and 13C nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) and high-resolution mass spectrometry (HRMS) data analysis. The derivat...

SÍNTESES TOTAIS NO BRASIL EMPREGANDO ACOPLAMENTOS CRUZADOS MEDIADOS POR PALÁDIO

This article aims to show the selected total syntheses of organic compounds conducted by Brazilian researchers, performed in Brazil, which have employed a palladium catalyzed cross-coupling reaction as key step. We intended to thus create an account, although restricted to the use of palladium, showing the evolution and current state of art of Synthetic Organic Chemistry in Brazil, which has advanced and accept...

CRAQUEAMENTO TÉRMICO DA GLICERINA: UMA PROPOSTA DE EXPERIMENTO PARA QUÍMICA ORG...

Efficient synthesis of 1,3,5-oxygenated synthons from dimethyl 3-oxoglutarate: ...

The selective reduction of dimethyl 3-oxoglutarate was accomplished in different levels. A high yielding sodium borohydride reduction of the keto group is fully described leading to dimethyl 3-hydroxyglutarate. When borane-dimethyl sulfide (BMS) complex was used, a diol or a triol compound can be obtained by selective or total reduction of 3-hydroxy- or 3-oxoglutarate, respectively, allowing an efficient and pr...

Reação da cânfora com boroidreto de sódio: uma estratégia para o estudo da este...

Reduction of camphor to a mixture of borneol and isoborneol was performed using NaBH4 as the reducing agent under suitable conditions. Although more effective reduction was accomplished using toxic methanol, an alternative non-toxic ethanolic system is described. This experiment is important to introduce undergraduate students in reductive procedures, and can be used to show details on stereoselective procedure...

The stereochemistry of the Nozaki-Hiyama-Kishi reaction and the construction of...

The use of the intramolecular Nozaki-Hiyama-Kishi reaction to construct 10-membered lactones is described. The influence of the nature of the protecting groups at C4 and C5 on the stereochemistry of the newly formed stereogenic center at C7 was investigated. The utility of this methodology has been demonstrated in the stereoselective total synthesis of (-)-decarestrictine D from 1,3-propanediol and polyhydroxyb...