Einwirkung von <i>p</i>‐Nitroso‐dimethylanilin auf Brenztraubensäure und ihre Derivate, II

Tănăsescu, Ioan; Ruse, Margareta

doi:10.1002/cber.19630960703

Cited by 2 publications

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“…The PNDA can act as reducing and oxidation agent. The oxidation of the pyruvic acid with the PNDA as a side reaction could explain the smaller rate constant. , …”

Section: Resultsmentioning

confidence: 99%

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Laboratory Kinetic and Mechanistic Studies on the OH-Initiated Oxidation of Acetone in Aqueous Solution

et al. 2012

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The OH-initiated oxidation of acetone in aqueous solution is investigated because of its potential implications in atmospheric chemistry. The UV-spectrum of the transient acetonylperoxy radical was measured. Two characteristic absorption bands of the acetonylperoxy radical spectrum are found in the 220-400 nm wavelength region. The rate constant for the recombination reaction of the acetonylperoxy radical was determined as a function of temperature for the first time in aqueous solution with k(rec,298 K) = (7.3 ± 1.3) × 10(8) M(-1) s(-1), E(A) = 4.5 ± 3.3 kJ mol(-1), and A = (4.7 ± 2.7) × 10(9) M(-1) s(-1). Furthermore, kinetic investigations of the OH-initiated oxidation of methylglyoxal and pyruvic acid were performed with the following results: for methylglyoxal, k(second) = (6.2 ± 0.2) × 10(8) M(-1) s(-1), E(A) = 12 ± 2 kJ mol(-1), and A = (7.8 ± 0.2) × 10(9) M(-1) s(-1); for pyruvic acid (pH = 0), k(second) = (3.2 ± 0.6) × 10(8) M(-1) s(-1), E(A) = 15 ± 5 kJ mol(-1), and A = (1.1 ± 0.1) × 10(11) M(-1) s(-1); for pyruvate (pH = 6), k(second) = (7.1 ± 2.4) × 10(8) M(-1) s(-1), E(A) = 25 ± 19 kJ mol(-1), and A = (1.5 ± 0.4) × 10(13) M(-1) s(-1). Quantitative product studies were done as a function of the number of laser photolysis pulses for acetone and its oxidation products methylglyoxal, hydroxyacetone, pyruvic acid, acetic acid, and oxalic acid. After the recombination reaction of acetonylperoxy radicals, there are two possible decomposition reactions where the primary products methylglyoxal and hydroxyacetone are formed. From product analysis after a single photolysis laser shot, the ratio of the main product-forming reactions was determined as (A) 30% and (B) 56% for the methylglyoxal formation via channel A to yield two molecules of methylglyoxal and channel B to yield one molecule of methylglyoxal and one molecule of hydroxyacetone. The remaining product can be ascribed to channel C, the radical-retaining channel forming alkoxy radicals with a yield of 14%. Pyruvic acid and acetic acid were found to be the major intermediates estimated with concentrations in the same order of magnitude and a similar time profile, indicating that acetic acid is also a possible oxidation product of methylglyoxal.

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“…The PNDA can act as reducing and oxidation agent. The oxidation of the pyruvic acid with the PNDA as a side reaction could explain the smaller rate constant. , …”

Section: Resultsmentioning

confidence: 99%

“…The oxidation of the pyruvic acid with the PNDA as a side reaction could explain the smaller rate constant. 47,48 Oxidation Products and Mechanism. In Figures 10 and 11, the time profiles of acetone and the measured oxidation products are shown.…”

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confidence: 99%

Laboratory Kinetic and Mechanistic Studies on the OH-Initiated Oxidation of Acetone in Aqueous Solution

et al. 2012

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Einwirkung von p‐Nitroso‐dimethylanilin auf Brenztraubensäure und ihre Derivate, V. Notiz zur Kondensation der Phenylbrenztraubensäuren mit primären aromatischen Aminen

Ruse¹,

Hamburg²,

Petri³

1970

Chem. Ber.

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In Fortsetzung fruherer Untersuchungen2.3) zur Einwirkung von p-Nitroso-bzw. p-Aminodimethylanilin auf Brenztraubensaure und ihre Derivate berichten wir hier uber die Kondensation einiger substituierter Aniline (mit $-M-bzw. -M-Substituenten) mit Phenylbrenztraubensanre, o-Nitro-und o-Chlor-phenylbrenztrau bensaure. Deren [Jmsetzung mit p-Aminophenol in annahernd gesattigter alkoholischer Losung bei Raumtemperatur fuhrte lediglich zur Bildung der entsprechenden p-Hydroxy-anilinium-Salze, die so leicht zu isolieren sind,

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Einwirkung von p‐Nitroso‐dimethylanilin auf Brenztraubensäure und ihre Derivate, II

Cited by 2 publications

References 3 publications

Laboratory Kinetic and Mechanistic Studies on the OH-Initiated Oxidation of Acetone in Aqueous Solution

Laboratory Kinetic and Mechanistic Studies on the OH-Initiated Oxidation of Acetone in Aqueous Solution

Einwirkung von p‐Nitroso‐dimethylanilin auf Brenztraubensäure und ihre Derivate, V. Notiz zur Kondensation der Phenylbrenztraubensäuren mit primären aromatischen Aminen

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