Results 231 to 240 of about 26,979 (280)
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The Journal of Organic Chemistry, 1996
The structure and energetics of protonated p-benzoquinone (pBQ) have been investigated using high-pressure mass spectrometry and ab initio calculations. The experimental proton affinity of pBQ is 801.4 +/- 8.9 kJ/mol (191.5 +/- 2.1 kcal/mol) (1sigma) from bracketing measurements and hydration thermochemistry.
Karl K., Irikura +4 more
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The structure and energetics of protonated p-benzoquinone (pBQ) have been investigated using high-pressure mass spectrometry and ab initio calculations. The experimental proton affinity of pBQ is 801.4 +/- 8.9 kJ/mol (191.5 +/- 2.1 kcal/mol) (1sigma) from bracketing measurements and hydration thermochemistry.
Karl K., Irikura +4 more
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The reaction of benzoquinone with amines and proteins
Archives of Biochemistry and Biophysics, 1969Abstract It has been shown that benzoquinone will form 1,4 addition products with amines, amino acids, and proteins. The substituted quinones produced via this reaction have altered redox potentials. The quinone amine adduct can be reduced by ascorbate and oxidized by oxygen to produce hydrogen peroxide. This sequence of reactions can be conveniently
M, Morrison, W, Steele, D J, Danner
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Aqueous Photochemistry of Methyl-Benzoquinone
The Journal of Physical Chemistry A, 2008Chemical trapping studies combined with optical and electron paramagnetic resonance measurements were employed to examine the mechanisms of the aqueous photochemistry of methyl-benzoquinone (mBQ) at both low and high quinone concentrations. At low [mBQ], dimethylsulfoxide (DMSO) reacted with a photogenerated intermediate to form a methyl radical, but ...
Daqing, Gan +4 more
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Amino-substituted p-benzoquinones
Journal of Medicinal Chemistry, 1986Based on the observation of outstanding antineoplastic activity of a number of amino-substituted anthraquinones, thioxanthones, and N-(aminoethyl)-substituted naphthalimides, four types of amino-substituted p-benzoquinones were designed, synthesized, and their biological activity evaluated. Although none of these compounds exhibited inhibitory activity
A E, Mathew, R K, Zee-Cheng, C C, Cheng
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High-pressure infrared spectra of 1,4-benzoquinone and tetrafluoro-1,4-benzoquinone
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1996Abstract The pressure dependence of the infrared spectra (600–1800, 2500–3600 cm −1 ) has been measured for 1,4-benzoquinone(2,5-cyclohexadiene-1,4-dione) and fluoranil (2,3,5,6-tetrafluoro-2,5-cyclohexadiene-1,4-dione). No phase changes occur in either compound over the pressure range from ambient pressure to 50 kbar in benzoquinone and to 40 kbar ...
Jianfang Wang, D.F.R. Gilson
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Journal of the American Chemical Society, 1990
Etude des especes transitoires obtenues par irradiation a 355 et 532 nm de la benzoquinone-1,4 avec le t-butylethylene, les tetramethyl- et tetraphenyl ...
Schnapp, Karyln A. +4 more
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Etude des especes transitoires obtenues par irradiation a 355 et 532 nm de la benzoquinone-1,4 avec le t-butylethylene, les tetramethyl- et tetraphenyl ...
Schnapp, Karyln A. +4 more
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On the nature of protein benzoquinone complexes
Experientia, 1976Proteins form monosubstituted 1,4-benzoquinone derivatives with an excess of reagent via uniformly coloured charge transfer complexes. Some properties of these compounds are reported.
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The Addition of Dimethylamine to Benzoquinone
Journal of the American Chemical Society, 1948R, BALTZLY, E, LORZ
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Chromatographic analysis of benzoquinones
Journal of Chromatography A, 1963openaire +2 more sources