Montagem de câmara com lâmpada de ultravioleta de baixo custo

Alvarenga, Elson S.; Saliba, William Argolo; Milagres, Benjamin G.

doi:10.1590/s0100-40422005000500034

Cited by 19 publications

(18 citation statements)

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“…The reactions were followed by visualizing the thin layer chromatography plates coated with silica‐gel in a ultraviolet chamber at 254 nm . The furan‐2(5 H )‐one 6 was obtained as previously described .…”

Section: Methodsmentioning

confidence: 99%

Herbicidal activity of isobenzofuranones and in silico identification of their enzyme target

Teixeira

Alvarenga

Lopes

et al. 2019

Pest Management Science

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BACKGROUND Given the weed resistance to various herbicides with different mechanisms of action, the search for new compounds that are more effective and exhibit low levels of impact to other species in nature has been imperative in the field of the agriculture. For this purpose, 16 phthalides, and furan‐2(5H)‐one were synthetized and evaluated for their effectiveness as herbicides in seeds of Sorghum bicolor (sorghum), Cucumis sativus (cucumber), and Allium cepa (onion). Furthermore, a preliminary in silico study was carried out to identify the enzyme target of the most active compounds. RESULTS In the assays with S. bicolor, the mixture rac‐(3aR,4R,5S,6S,7S,7aS)‐5,6‐dibromohexahydro‐4,7‐methanoisobenzofuran‐1(3H)‐one + rac‐(3aR,4R,5R,6R,7S,7aS)‐5,6‐dibromohexahydro‐4,7‐methanoisobenzofuran‐1(3H)‐one (15a + 15b) showed comparable inhibitory activity to (S)‐metolachlor, which was used as control herbicide at concentrations ranging from 50 μm to 1000 μm. The developments of the seeds evaluated were altered by all 17 compounds, either stimulating or inhibiting. The best results were presented by compounds 15a, and 15b, either in their pure form or as a mixture. CONCLUSION The results presented by 15a, and 15b were superior to the activity of the commercial herbicide (S)‐metolachlor in the assays with C. sativus, and A. cepa. The in silico study provides strong evidence that the most active compounds bind to strigolactones esterases D14 through the same binding site of (5R)‐5‐hydroxy‐3‐methylfuran‐2(5H)‐one (H3M), which is one of the strigolactones (SLs) cleavage products. © 2019 Society of Chemical Industry

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Section: Methodsmentioning

confidence: 99%

Herbicidal activity of isobenzofuranones and in silico identification of their enzyme target

Teixeira

Alvarenga

Lopes

et al. 2019

Pest Management Science

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“…5‐Hydroxyfuran‐2(5 H )‐one was prepared as previously described . The progress of the reactions was checked by TLC with precoated plates of silica gel . Column chromatography was carried out on silica gel (60–230 mesh).…”

Section: Methodsmentioning

confidence: 99%

“…[52] The progress of the reactions was checked by TLC with precoated plates of silica gel. [53] Column chromatography was carried out on silica gel (60-230 mesh). Melting points were determined on a MQAPF-301 melting point apparatus and are uncorrected.…”

Section: Methodsmentioning

confidence: 99%

Structural elucidation of dioxa‐cage compounds from tetrahydroisobenzofuran‐1(3H)‐one: analysis of NMR data and GIAO chemical shifts calculations

Resende

Alvarenga

2016

Magnetic Reson in Chemistry

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The polycyclic compounds, especially the dioxa-cages, have attracted considerable attention in recent years. In our work, a series of 9β-substituted 3-oxo-4,11-dioxatetracyclo[5.2.1.1 .0 ]undecane compounds were unexpectedly isolated during bromination, chlorination and epoxidation reactions of the 3-hydroxy-3a,4,7,7a-tetrahydro-4,7-methanoisobenzofuran-1(3H)-one. After careful analysis of the NMR data, the chemical shifts of the isolated and the expected products were predicted by theoretical calculations using density functional theory and gauge including atomic orbitals. The best correlation between calculated and experimental data was evaluated by comparing mean absolute errors and applying DP4 probability methodology. Results from both approaches indicated a correct structural elucidation. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Estes aparelhos incluem desde reatores fotoquímicos, capelas germicidas até fornos de microondas, que vêm sendo utilizados nos laboratórios. [1][2][3] Tal eficiência está relacionada ao fato de que determinados sistemas químicos podem absorver energia eletromagnética de forma mais efetiva do que, por exemplo, energia térmica. Entretanto, os equipamentos de emissão de ondas eletromagnéticas para laboratório são geralmente caros e nem sempre oferecem características desejadas, como dimensões e potência compatíveis.…”

Section: Introductionunclassified

Construção de câmara de luz ultravioleta para fotopolimerização de fases estacionárias monolíticas

Vaz¹,

Oliveira²,

Queiroz³

et al. 2008

Quím. Nova

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Montagem de câmara com lâmpada de ultravioleta de baixo custo

Cited by 19 publications

References 0 publications

Herbicidal activity of isobenzofuranones and in silico identification of their enzyme target

Herbicidal activity of isobenzofuranones and in silico identification of their enzyme target

Structural elucidation of dioxa‐cage compounds from tetrahydroisobenzofuran‐1(3H)‐one: analysis of NMR data and GIAO chemical shifts calculations

Construção de câmara de luz ultravioleta para fotopolimerização de fases estacionárias monolíticas

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