scholarly journals Molecular Structure of the Photo-Oxidation Product of Ellagic Acid in Solution

ACS Omega ◽  
2018 ◽  
Vol 3 (9) ◽  
pp. 11179-11183
Author(s):  
Hisashi Tokutomi ◽  
Takashi Takeda ◽  
Norihisa Hoshino ◽  
Tomoyuki Akutagawa
Keyword(s):  
Molecular Structure ◽  
Ellagic Acid ◽  
Oxidation Product ◽  
Photo Oxidation

Chalkogenolat-Ionen und ihre Derivate, V Kristall- und Molekülstruktur von 2.8-Dimethyldibenzo [c.g] [1.2.5.6] tetrathiacyclooktadien, einem Oxidationsprodukt von 4-Methylbenzol-1.2-dithiol/Chalcogenolates and their Derivatives, V Crystal and Molecular Structure of 2.8-Dimethyldibenzo[c,g][1,2,5,6]tetrathiaocin, an Oxidation Product of 4-Methylbenzene-1,2-dithiol

1979 ◽  
Vol 34 (1) ◽  
pp. 48-51 ◽  
Author(s):  
Jürgen Kopf ◽  
Klaus von Deuten ◽  
Bahman Nakhdjavan ◽  
Günter Klar
Keyword(s):  
Molecular Structure ◽  
Dihedral Angle ◽  
Oxidation Product ◽  
Crystal And Molecular Structure ◽  
X Ray ◽  
The Mean ◽  
Ray Methods ◽  
Anti Form

Abstract The structure of 2,8-dimethyldibenzo[c,g][1,2,5,6]tetrathiaocin (1b) has been determined by X-ray methods and discussed in connection with the preferred conformations of diaryl disulfides. The compound has the anti-form I. The SS-distance is 205.8 pm, the mean CSS-angle 104.1°, and the CSS/SSC-dihedral angle 111.1°.

scholarly journals Characterization of a photoproduct of 7,12-dimethylbenz[a]anthracene and its effects on chick-embryo cells in culture

1977 ◽  
Vol 164 (3) ◽  
pp. 481-486 ◽  
Author(s):  
D Warshawsky ◽  
E Kerns ◽  
M J Bissell ◽  
M Calvin
Keyword(s):  
Chick Embryo ◽  
Dna Synthesis ◽  
Oxidation Product ◽  
Biological Effects ◽  
Cell Number ◽  
Resonance Spectroscopy ◽  
Morphological Transformation ◽  
Morphological Alterations ◽  
Photo Oxidation ◽  
Embryo Cells

A common impurity of 7,12-dimethylbenz[alpha]anthracene was more effective than 7,12-dimethylbenz[alpha]anthracene in inducing morphological alterations, and in causing an increase in glucose uptake, DNA synthesis and cell number in chick-embryo fibroblasts. Gradual morphological transformation follows the increase in DNA synthesis after 2 days when either primary or secondary cultures are treated with 3 microgram of the compound/ml. The compound, isolated from 7,12-dimethylbenz[alpha]anthracene by alumina column chromatography, was characterized by t.l.c., mass spectroscopy, carbon-hydrogen analysis, u.v. and nuclear-magnetic-resonance spectroscopy and thermal decomposition. It was the photo-oxidation product of 7,12-dimethylbenz[alpha]anthracene, 7,12-epidioxy-7,12-dimethylbenz[alpha]anthracene. It is suggested that some of the biological effects observed after treatment of cultures with 7,12-dimethylbenz[alpha]anthracene may be due in part to the presence of the photo-oxidation product.

The Photo-Oxidation of Polypropylene Monofilaments

1977 ◽  
Vol 47 (6) ◽  
pp. 423-428 ◽  
Author(s):  
A. Garton ◽  
D. J. Carlsson ◽  
P. Z. Sturgeon ◽  
D. M. Wiles
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Uv Irradiation ◽  
Oxidation Product ◽  
Uv Exposure ◽  
Thin Surface Layer ◽  
Elongation At Break ◽  
Photo Oxidation ◽  
Oriented Samples ◽  
Oriented Polypropylene

The elongation-at-break of highly-oriented polypropylene monofilaments is much less affected by photo-oxidation build-up than undrawn or partially-oriented filaments. This appears to result from the very poor lateral cohesion of the fibril bundles in the highly-oriented filament, limiting restructuring and cracking to a thin surface layer. For less-oriented samples photo-oxidation-induced restructuring of the surface layer results in deep cracks that can propagate under stress, greatly embrittling the sample. Areas of filaments cold drawn by, for example, bending or stretching deteriorate very rapidly on uv irradiation as a result of strain-induced chromophore formation, and fracture occurs first at these points. Oxidation-product levels (either hydroperoxide or carbonyl) are shown to be an unreliable index of the extent of deterioration of mechanical properties resulting from uv exposure.

Rotational spectroscopy of the atmospheric photo-oxidation product o-toluic acid and its monohydrate

2016 ◽  
Vol 18 (1) ◽  
pp. 448-457 ◽  
Author(s):  
Elijah G. Schnitzler ◽  
Brandi L. M. Zenchyzen ◽  
Wolfgang Jäger
Keyword(s):  
Oxidation Product ◽  
Minimum Energy ◽  
Rotational Spectroscopy ◽  
Rotational Spectra ◽  
Photo Oxidation

Pure rotational spectra of an atmospheric photo-oxidation product, o-toluic acid, and its monohydrate were measured, and the minimum energy conformers of both species were identified.

scholarly journals The Crystal and Molecular Structure of 1-(beta-Aminoethyl)-4-hydroxy-5-iodo-3,6-benzoquinone, an Oxidation Product of 6-Hydroxydopamine.

1979 ◽  
Vol 33b ◽  
pp. 265-270 ◽  
Author(s):  
A. M. Opheim ◽  
Sten Gatenbeck ◽  
Olof Wennerström ◽  
K. Lempert ◽  
J. Møller ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Oxidation Product ◽  
Crystal And Molecular Structure ◽  
6 Hydroxydopamine

Quinones and quinone methides. X. The crystal structure of a dimeric oxidation product from 2,4-Bis(1,1-dimethylethyl)-6-[(4-methoxyphenyl)methyl]phenol

1984 ◽  
Vol 37 (12) ◽  
pp. 2593
Author(s):  
RY Wong ◽  
L Jurd
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Oxidation Product ◽  
Crystallographic Analysis ◽  
Quinone Methides ◽  
X Ray ◽  
A Minor

The molecular structure of a minor oxidation product of the insect sterilant 2,4-bis(1,1-dimethylethyl) 6-[(4-methoxyphenyl)methyl]phenol has been established as (�)-cis-1,3,6,8-tetrakis(1,1-dimethyl-ethyl)-4b,9b-bis(4-methoxyphenyl)-4b,9b-dihydrobenzofuro[3,2-b]benzofuran by means of X-ray crystallographic analysis.

scholarly journals Observation of 2-methyltetrols and related photo-oxidation products of isoprene in boreal forest aerosols from Hyytiälä, Finland

2005 ◽  
Vol 5 (3) ◽  
pp. 2947-2971 ◽  
Author(s):  
I. Kourtchev ◽  
T. Ruuskanen ◽  
W. Maenhaut ◽  
M. Kulmala ◽  
M. Claeys
Keyword(s):  
Boreal Forest ◽  
Atmospheric Chemistry ◽  
Oxidation Product ◽  
Unsaturated Fatty Acids ◽  
Oxidation Products ◽  
Conifer Forest ◽  
Aerosol Formation ◽  
Summer Period ◽  
Photo Oxidation ◽  
Pinic Acid

Abstract. Oxidation products of isoprene including 2-methyltetrols (2-methylthreitol and 2-methylerythritol), 2-methylglyceric acid and triol derivatives of isoprene (2-methyl-1,3,4-trihydroxy-1-butene (cis and trans) and 3-methyl-2,3,4-trihydroxy-1-butene) have been detected in boreal forest PM1 aerosols collected at Hyytiälä, southern Finland, during a 2004 summer period, at significant atmospheric concentrations (in total 51 ng m-3 in summer versus 0.46 ng m-3 in fall). On the basis of these results, it can be concluded that photo-oxidation of isoprene is an important atmospheric chemistry process that contributes to secondary organic aerosol formation during summer in this conifer forest ecosystem. In addition to isoprene oxidation products, malic acid, which can be regarded as an end-oxidation product of unsaturated fatty acids, was also detected at high concentrations during the summer period (46 ng m-3 in summer versus 5.2 ng m-3 in fall), while levoglucosan, originating from biomass burning, became relatively more important during the fall period (29 ng m-3 in fall versus 10 ng m-3 in summer). Pinic acid, a major photo-oxidation product of α-pinene in laboratory experiments, could only be detected at trace levels in the summer PM1 aerosol samples from Hyytiälä, suggesting that further oxidation of pinic acid occurs and/or that different oxidation pathways are followed. We hypothesize that photo-oxidation of isoprene may participate in the early stages of new particle formation, a phenomenon which has been well documented in the boreal forest environment.

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