Photochemistry of Methyl Ethyl Ketone: Quantum Yields and S 1 /S 0 ‐Diradical Mechanism of Photodissociation

ChemPhysChem ◽  
2010 ◽  
Vol 11 (18) ◽  
pp. 3883-3895 ◽  
Author(s):  
Rebeka Nádasdi ◽  
Gábor L. Zügner ◽  
Mária Farkas ◽  
Sándor Dóbé ◽  
Satoshi Maeda ◽  
...  
Keyword(s):  
Methyl Ethyl Ketone ◽  
Quantum Yields ◽  
Methyl Ethyl

Photooxidation of methyl ethyl ketone vapor

1967 ◽  
Vol 45 (22) ◽  
pp. 2741-2748 ◽  
Author(s):  
D. E. Hoare ◽  
D. A. Whytock
Keyword(s):  
Methyl Ethyl Ketone ◽  
Relative Rate ◽  
Quantum Yields ◽  
Methyl Ethyl ◽  
Hydrogen Atoms ◽  
Methyl Group ◽  
Ethyl Group ◽  
Relative Rate Constants ◽  
The Individual ◽  
Time Extrapolation

The photochemical reaction between methyl ethyl ketone and oxygen has been studied at 150 °C with light of 3 130 Å. Measurement of the quantum yields of the major products of the reaction indicates the chain nature of the reaction, the length of the chain decreasing with increase in time. Extrapolation of quantum yields of products to zero time allows the evaluation of several relative rate constants and at least an indication of the individual radical sources of the observed products. It is shown that abstraction of hydrogen atoms from the methyl group takes place at least at a quarter the rate of abstraction of a secondary hydrogen from the ethyl group at 150 °C. In the initial products the ethyl group gives mainly acetaldehyde or perpropionic acid, the methyl group gives formaldehyde and methanol, and the carbonyl group gives carbon dioxide and perpropionic acid with a little carbon monoxide.

scholarly journals Inside Cover: Photochemistry of Methyl Ethyl Ketone: Quantum Yields and S 1 /S 0 ‐Diradical Mechanism of Photodissociation (ChemPhysChem 18/2010)

ChemPhysChem ◽  
2010 ◽  
Vol 11 (18) ◽  
pp. 3774-3774 ◽  
Author(s):  
Rebeka Nádasdi ◽  
Gábor L. Zügner ◽  
Mária Farkas ◽  
Sándor Dóbé ◽  
Satoshi Maeda ◽  
...  
Keyword(s):  
Methyl Ethyl Ketone ◽  
Quantum Yields ◽  
Methyl Ethyl

Oxidation of Acetone and Methyl Ethyl Ketone by Ceric Ions in Aqueous Solution

1958 ◽  
Vol 16 (1_2) ◽  
pp. 73-84 ◽  
Author(s):  
S. Venkatakrishnan ◽  
M. Santappa
Keyword(s):  
Aqueous Solution ◽  
Methyl Ethyl Ketone ◽  
Methyl Ethyl

Highly efficient synthesis of methyl ethyl ketone oxime through ammoximation over Ti-MOR catalyst

2014 ◽  
Vol 34 (1) ◽  
pp. 243-250
Author(s):  
Jianghong DING ◽  
Le XU ◽  
Hao XU ◽  
Haihong WU ◽  
Yueming LIU ◽  
...  
Keyword(s):  
Methyl Ethyl Ketone ◽  
Methyl Ethyl ◽  
Efficient Synthesis ◽  
Highly Efficient

Electroinduced oxidative copolymerization ofN-vinyl carbazole with methyl ethyl ketone formaldehyde resin

2004 ◽  
Vol 15 (7) ◽  
pp. 365-369 ◽  
Author(s):  
Belkıs Ustamehmetoğlu ◽  
A. Sezai Saraç ◽  
Nilgün Kızılcan ◽  
Ahmet Akar
Keyword(s):  
Methyl Ethyl Ketone ◽  
Formaldehyde Resin ◽  
Methyl Ethyl ◽  
Oxidative Copolymerization

scholarly journals Lipozyme 435-Mediated Synthesis of Xylose Oleate in Methyl Ethyl Ketone

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3317
Author(s):  
Maria Carolina Pereira Gonçalves ◽  
Jéssica Cristina Amaral ◽  
Roberto Fernandez-Lafuente ◽  
Ruy de Sousa Junior ◽  
Paulo Waldir Tardioli
Keyword(s):  
Oleic Acid ◽  
Methyl Ethyl Ketone ◽  
Molar Ratio ◽  
Methyl Ethyl ◽  
Sugar Ester ◽  
Molar Ratios ◽  
Emulsion Capacity ◽  
Ping Pong ◽  
Commercial Sugar ◽  
Repeated Use

In this paper, we have performed the Lipozyme 435-catalyzed synthesis of xylose oleate in methyl ethyl ketone (MEK) from xylose and oleic acid. The effects of substrates’ molar ratios, reaction temperature, reaction time on esterification rates, and Lipozyme 435 reuse were studied. Results showed that an excess of oleic acid (xylose: oleic acid molar ratio of 1:5) significantly favored the reaction, yielding 98% of xylose conversion and 31% oleic acid conversion after 24 h-reaction (mainly to xylose mono- and dioleate, as confirmed by mass spectrometry). The highest Lipozyme 435 activities occurred between 55 and 70 °C. The predicted Ping Pong Bi Bi kinetic model fitted very well to the experimental data and there was no evidence of inhibitions in the range assessed. The reaction product was purified and presented an emulsion capacity close to that of a commercial sugar ester detergent. Finally, the repeated use of Lipozyme 435 showed a reduction in the reaction yields (by 48 and 19% in the xylose and oleic acid conversions, respectively), after ten 12 h-cycles.

scholarly journals Effect of Sonic Agitation of a Binary Mixture of Solvents on Filling Remnants Removal as an Alternative to Apical Enlargement—A Micro-CT Study

2020 ◽  
Vol 9 (8) ◽  
pp. 2465
Author(s):  
Inês Ferreira ◽  
Pedro S. Babo ◽  
Ana Cristina Braga ◽  
Manuela E. Gomes ◽  
Irene Pina-Vaz
Keyword(s):  
Binary Mixture ◽  
Methyl Ethyl Ketone ◽  
Solvent Mixture ◽  
Methyl Ethyl ◽  
Micro Computed Tomography ◽  
Significance Level ◽  
Root Canals ◽  
Gutta Percha ◽  
Ah Plus ◽  
Mandibular Incisors

Background: This work aimed to evaluate the efficacy of sonic agitation of a binary mixture of solvents (methyl ethyl ketone/tetrachloroethylene) on filling remnants removal and compare the effects of solvent agitation with the enlargement to the next instrument size. Methods: Twenty-four mandibular incisors were prepared with ProTaper Next (X1, X2) and obturated with the single-cone technique and AH Plus sealer. The teeth were retreated with ProTaper Universal Retreatment and ProTaper Next and divided into two groups (n = 12) according to the final instrument (X3 or X4). All canals were submitted to a supplementary procedure consisting of a mixture of solvents―methyl ethyl ketone/tetrachloroethylene, agitated with EndoActivator. The volume of filling remnants was assessed through micro-computed tomography in the apical 5 mm. Statistical analysis was performed with a significance level of 5%. Results: The supplementary procedure of agitation of the solvent mixture was beneficial in both groups (p < 0.05). There were no statistically significant differences between canals re-prepared until X4 and canals re-prepared until X3 plus solvent (p > 0.05). Conclusions: An additional step with a two-solvent solution potentiated by EndoActivator showed to be very effective for the removal of gutta-percha and resinous sealer remnants from apical root canals of mandibular incisors, avoiding further enlargement.

Pervaporation for the Separation of Methyl Ethyl Ketone from Binary Process Mixtures

1997 ◽  
Vol 32 (6) ◽  
pp. 1127-1142
Author(s):  
C. S. Slater ◽  
K. M. Devine ◽  
A. J. Meier
Keyword(s):  
Methyl Ethyl Ketone ◽  
Methyl Ethyl ◽  
Binary Process
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