Flavanones and Related Compounds. VI. The Polarographic Reduction of Some Substituted Chalcones, Flavones and Flavanones

Geissman, T. A.; Friess, S.L.

doi:10.1021/ja01180a006

Cited by 39 publications

(12 citation statements)

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“…These results are in good agreement with the work published by Avila and Previtali, 40 who observed two absorption maxima at 370 nm (the most intense) and 620 nm, and these maxima were practically Table 1 First-order rate constants and triplet lifetimes in the absence of quenchers. The ground state reduction potential E , the triplet state energy E T , and the triplet state reduction potentials E * of the three photosensitizers are also given [61][62][63][64][65][66] k decay (ms À1 ) 266 nm s (ms) 266 nm independent of the solvent used (benzene, ethanol, and acetonitrile). For the determination of lifetimes and quenching rate coefficients, the triplet state decay was monitored at the wavelengths reported above.…”

Section: Triplet State Transient Absorption Spectrummentioning

confidence: 99%

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Quenching of ketone triplet excited states by atmospheric halides

Gemayel

Emmelin

Perrier

et al. 2021

Environ. Sci.: Atmos.

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Section: Triplet State Transient Absorption Spectrummentioning

confidence: 99%

“…Reaction (1) rate constants k 1 for quenching of ketone triplet states by different halide ions following excitation at 266 nm and 355 nm, redox potentials (E(X À )/X) for the anions and the free energy of the electron transfer DG ET . Values were obtained with 3 experimental repetitions[61][62][63][64][65][66] …”

mentioning

confidence: 99%

Quenching of ketone triplet excited states by atmospheric halides

Gemayel

Emmelin

Perrier

et al. 2021

Environ. Sci.: Atmos.

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“…The electric-activate group in THDB and TTDB was carbonyl group [16,17].As can be observed in Fig. 5, there was one oxidation peak and two reduction peaks in THDB.…”

Section: Results Of Cyclic Voltammetrymentioning

confidence: 99%

Synthesis, crystal structure and studies on properties of trisodium 5,3′,5′-trisulfonate-2,3,4,4′-tetrahydroxy-deoxybenzoin

Xiao

Liu

et al. 2006

Front. Chem. China

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Synthesis, crystal structure and studies on properties of trisodium 5,3′,5′-trisulfonate-2,3,4,4′-tetrahydroxy-deoxybenzoin Abstract A new water soluble compound trisodium 5,3′, 5′-trisulfonate-2,3,4,4′-tetrahydroxy-deoxybenzoin (TTDB) was synthesized and characterized by IR, UV, 1 H NMR, and elemental analysis. The single crystal of TTDB was determined by X-ray single crystal diffraction. The scavenging effect of compounds on hydroxy radicals was detected by fluorescent spectrophotometry. The electrochemical behavior of compounds in nonaqueous solution DMF was carried out by means of cyclic voltammetry. The experimental result shows that the crystal [C 14 H 17 Na 3 O 18 S 3 ] belongs to monoclinic, space group C2/c with unit cell constants a = 1.4223(4) nm, b = 2.4327(8) nm, c = 1.3596(4) nm, α = 90º, β = 113.044(5)º, γ = 90º, Z = 8, V = 4.329(2) nm 3 , D c = 1.925 mg/m 3 , F(000) = 2568, F w = 638.43, R 1 = 0.0950, wR 2 = 0.2648. The half effective concentration EC 50 of scavenging hydroxy radicals of compound THDB is 53.1 μmol/L, while that of scavenging hydroxy radicals of compound TTDB is 47.3μmol/L. The electrochemistry redox processes of THDB and TTDB are different from each other.

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“…In the aromatic unsaturated ketone series the effect of the substitution of hydroxy-1 groups in chalcones (X) upon the amount of b¡molecular reduction and normal reduction at the dropping mercury electrode has been studied for 16 chalcones (X) (68).…”

Section: Illmentioning

confidence: 99%

“…Flavones as a rule give two reduction waves which may coa- lesee if hydroxyl groups or derivatives of these are present. Each wave involves one electron and represents reduction to the pinacol and alcohol, respectively (68).…”

Section: XXImentioning

confidence: 99%

Organic Polarography

Wawzonek¹

1952

Anal. Chem.

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in the field of organic polarography in the past two years have extended the use of this method to a variety of new groups. Contributing to this increase has been the greater use of solid electrodes. More electrode reactions have been verified by large scale electrolysis under controlled conditions with the isolation of products. In general, conclusions drawn from such experiments are in good agreement with the reactions at the electrode. Occasionally the products are different, as the large scale experiments involve rapid stirring and are not dependent solely upon a diffusion process. Intermediates, therefore, may be removed from the electrode surface to the solution where dimerization, disproportionation, or rearrangement may occur.The possibilities of the cathode-ray polarograph in the organic and reaction kinetics fields have been indicated ( 178). An extensive list of half-wTave potentials of organic compounds with the conditions used has been published (318).As in the past, most of the studies have been carried out in mixtures of organic solvents and water. The number of anhydrous solvents employed has been small and consists of methyl Cellosolve (11$), methanol (IBS), ethanol, 1-propanol, butanol, ethylene glycol, glycerol, and solutions of some of these with benzene or dioxane (46). The diffusion current was found to be inversely proportional to the square root of the viscosity of the solvents, and the waves became more drawn out as the amount of alcohol was decreased in dioxane mixtures with methanol, ethanol, and 1-propanol (46).As supporting electrolytes the tetraalkylammonium salts have continued to be useful. Their range has been found to be dependent upon their purity. It has been suggested that catalytic

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Flavanones and Related Compounds. VI. The Polarographic Reduction of Some Substituted Chalcones, Flavones and Flavanones

Cited by 39 publications

References 0 publications

Quenching of ketone triplet excited states by atmospheric halides

Quenching of ketone triplet excited states by atmospheric halides

Synthesis, crystal structure and studies on properties of trisodium 5,3′,5′-trisulfonate-2,3,4,4′-tetrahydroxy-deoxybenzoin

Organic Polarography

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