This work proposes an on-line preconcentration system using ion-imprinted polymer (IIP) for determination of bismuth in seawater employing atomic fluorescence spectrometry (AFS). The was synthesized 2- (5-bromo-2-pyridylazo) -5-diethylaminophenol (Br-PADAP) complex formation, ethylene glycol dimethacrylate (EGDMA), cross-linking reagent and methacrylic acid (AMA) reagents, used as the functional monomer, 2,2-azobisisobutyronitrile radical initiator. characterized Fourier transform infrared...

[reaction: see text] The addition of the titanium enolates N-acetyl, N-propionyl, and N-bromoacetyl (R)-oxazolidin-2-ones to gamma-lactol 2, derived from (S)-glutamic acid, afforded trans- cis-2,5-disubstituted tetrahydrofurans (trans/cis ratio: R = H, 2:1; Me, 8:1; Br, 10:1) after desilylation with aqueous HF/CH3CN. Chromatographic separation LiBH4 reduction allowed efficient preparation corresponding trans-2,5-disubstituted tetrahydrofuran diols recovery chiral auxiliary.

The sterochemical outcome of the addition chiral titanium enolates to gamma-lactols derived from (S)-glutamic acid were examined. When 5-substituted treated with N-acetyl-, N-propionyl-, N-bromoacetyl- and N-phenylacetyl oxazolidin-2-ones, only two diastereoisomers obtained, revealing complete facial control by enolate while oxocarbenium ion discrimination was dependent on nature R³ substituent. After desilylation aqueous HF/CH3CN, LiBH4 reduction allowed efficient preparation corresponding...

Spondias mombin L. is a Brazilian tree belonging to the family Anacardiaceae and popularly known as "cajá", genus well by various exotic fruit species such "siriguela" (S. purpurea), "umbu" tuberosa) "umbu-cajá" bahiensis).It presents commercial importance locals especially due small juice industries seeds are often discarded waste after pulping.Despite regional importance, even today there little information on chemical composition of these fruits.Thus, dichloromethane extract S. was...

Abstract Dechlorination reactions of exo-endo and endo-endo perhalogenated tetracyclic compounds with Li/t-BuOH/THF system, when subjected to simultaneous ultra-sound irradiation, led exceptionally high yields (77-95%) the corresponding hydrocarbons.

The selective reduction of dimethyl 3-oxoglutarate was accomplished in different levels. A high yielding sodium borohydride the keto group is fully described leading to 3-hydroxyglutarate. When borane-dimethyl sulfide (BMS) complex used, a diol or triol compound can be obtained by total 3-hydroxy- 3-oxoglutarate, respectively, allowing an efficient and practical route 1,3,5-oxygenated compounds.

The asymmetric synthesis of (+)-sitophilure, the aggregation pheromone Sitophilus oryzae L. and zeamais M., was carried out in 12 steps, 18% overall yield 82% enantiomeric excess from enzymatic reduction methyl 3-oxopentanoate with S. cerevisiae presence ethyl chloroacetate.

ORGANIC CHEMISTRY EXPERIMENTS.This work describes a green chemistry experiment for the synthesis of Erlenmeyer-Plöchl azalactones mediated by microwave irradiation, employing both dedicated and domestic equipment.Hippuric acid was reacted with equimolar amounts benzaldehyde, p-chloro-benzaldehyde or p-N,N-dimethyl-benzaldehyde in acetic anhydride as solvent.Acid hydrolysis obtained 4-benzylidene-2-phenyloxazol-5(4H)one under convectional heating afforded Z-α-(benzoylamino)cinnamic at...

UNDERGRADUATE ORGANIC CHEMISTRY EXPERIMENT.In this work, an undergraduate organic chemistry experiment based on thermal cracking of glycerin is proposed.The reagent obtained as a by-product from the practice biodiesel synthesis, and allows reduction waste produced in lab.The main product was characterized by GC analysis acrolein.This substance also identified chemical derivatization 2,4-dinitrophenylhydrazone, allowing combined identification synthesis derivative.

MICROALGAE: A SUSTAINABLE STRATEGY IN THE TRANSFORMATION AND OBTAINING OF ORGANIC COMPOUNDS. The present review presents the biotechnological potential of microalgae, highlighting its applications in biofuels, bioremediation, production bioactive compounds, biocatalysts, and biofertilizers. Microalgae are photosynthetic microorganisms that combine characteristics plants heterotrophic microorganisms, such as yeasts, bacteria, fungi. They can be considered agents extreme versatility metabolic...

Endophytic microorganisms are promising sources for new biocatalysts as they must deal with their host plants’ chemicals by developing adaptative strategies, such enzymatic pathways. As part of our efforts in selecting endophytic strains biocatalysts, this study describes the screening fungi isolated from Handroanthus impetiginosus leaves selective bioreduction Acetophenone. The bioreductions were monitored chiral gas chromatography and conducted to selection endophyte Talaromyces sp. H4...

MECHANOCHEMICAL CHLORINATION OF ACETANILIDE.We described herein a solvent-free synthesis of 4-chloroacetanilide both under hand grinding and mechanical stoichiometric amounts acetanilide with trichloroisocyanuric acid.The synthetic approach was developed in the context undergraduate organic chemistry is greener preparation this compound already described.

The maturity of the National Institute Science and Technology in Energy Environment (INCT E&A) to act a complex articulated way all areas science is portrayed this article.Several extralaboratory activities fields education, extension, popularization are shown.This commitment exemplified by "The Scientist Back School -CVE" program, which researchers go at high schools demystify aura

A short and efficient preparation of enantiomerically enriched (80% ee) (-)-serricornine (1), the sex pheromone cigarette beetle Lasioderma serricorne F., was developed in 8 steps 13% overall yield from methyl (R)-3-hydroxypentanoate readily prepared by baker's yeast reduction 3-oxopentanoate presence allyl alcohol as enzyme inhibitor.

To research the potential ability of whole marine sponges to act as biocatalysts, this paper describes for first time employment Cliona varians sponge in stereoselective reduction prochiral α-keto esters and isatin corresponding chiral alcohols.The addition D-fructose, D-glucose or sucrose remarkably increased conversion ratios stereoselectivities by sponge.Furthermore, presence D-maltose, C. afforded 3-hydroxyindolin-2-one with high conversions (85-90%) good enantioselectivities...

The environmental and health risks associated with the application of synthetic chemical inputs in agriculture increased demand for technologies that allow higher performance quality vegetable crops by implementing synergistic materials principles sustainability. In this work, seed coating biomass Dunaliella salina incorporated a bioplastic film Manihot esculenta (cassava) was evaluated as an initial growth secondary compounds stimulator Coriandrum sativum (coriander) plants. obtained...

The maturity of the National Institute Science and Technology in Energy Environment (INCT E&A) to act a complex articulated way all areas science is portrayed this article. Several extra-laboratory activities fields education, extension, popularization are shown. This commitment exemplified by Scientist Back School - CVE program, which researchers go at high schools demystify aura scientist, as well through Program Stimulate Scientific Vocation PROVOC, tutorials conducted state school INCT...

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