Results 291 to 300 of about 17,647 (331)

Amino-substituted p-benzoquinones

Journal of Medicinal Chemistry, 1986
Based 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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1,4-Benzoquinone

2001
[106-51-4] C6H4O2 (MW 108.10) InChI = 1S/C6H4O2/c7-5-1-2-6(8)4-3-5/h1-4H InChIKey = AZQWKYJCGOJGHM-UHFFFAOYSA-N (useful as an oxidizing1 or dehydrogenation agent;2 can function as a dienophile3 in the Diels–Alder reaction or as a dipolarophile to prepare 5-hydroxyindole derivatives4) Alternate Name: p-benzoquinone.
Teng-Kuei Yang, Chi-Yung Shen
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Thermochemistry of benzoquinones

The Journal of Chemical Thermodynamics, 2004
A thermochemical study of the p-benzoquinone and the duroquinone has been performed by different calorimetric techniques. Applying heat flux calorimetry and differential scanning calorimetry, the enthalpies of fusion for each substance were measured. Enthalpies of combustion in condensed phase were determined by static bomb combustion calorimetry hence
Aarón Rojas-Aguilar, Honorio Flores-Lara, Melchor Martinez-Herrera, Francisco Ginez-Carbajal   +3 more
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A fluorinated masked o-benzoquinone

Journal of Fluorine Chemistry, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Timothy B. Patrick, Hong Yu, Demitri Taylor, Keith Gorrell   +3 more
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Alkylated benzoquinones from Iris kumaonensis ☆

Phytochemistry, 2002
Six novel alkylated p-Benzoquinones irisoquin (A-F) (1-2, 4-7) together with a known cytotoxic quinone, irisoquin (3) along with three known isoflavones, tectoregenin, iristectorin and irigenin were isolated from the rhizomes of Iris kumaonensis and characterized.
Umar, Mahmood, Vijay K, Kaul, Leopold, Jirovetz   +2 more
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Methylation of substituted 1,4-benzoquinones

Collection of Czechoslovak Chemical Communications, 1987
Methylation of 1,4-benzoquinones I and Ia with diazomethane afforded methyl 15-(6-methoxy-3-methyl-1,4-benzoquinon-2-yl)pentadecanoate (IIa) and methyl 15-(3-methoxy-2,5-dioxobicyclo[4.1.0]hept-3-en-1-yl)pentadecanoate (IIIa), methylation of 1,4-benzoquinone IVa led to methyl 15-(5,6-dimethoxy-3-methyl-1,4-benzoquinon-2-yl)pentadecanoate (Va) and ...
Jaroslav Kopecký, David Šaman, Ladislav Novotný   +2 more
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Deslongchamps Annulations with Benzoquinone Monoketals

Organic Letters, 2011
The so-called Deslongchamps annulation of deprotonated γ,δ-unsaturated β-ketoesters 15 to 2-(alkoxycarbonyl)cyclohex-2-en-1-ones or similarly activated cyclohex-2-en-1-ones offers a versatile access to various kinds of decalindiones. The scope of Deslongchamps annulations was extended by establishing acceptor-substituted benzoquinone monoketals such as
Petrović, Denis, Brückner, Reinhard
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Larvicidal activity of para-Benzoquinones

Parasitology Research, 2010
Plant products may be alternative sources of mosquito larval control agents, since they constitute a rich source of bioactive compounds that are biodegradable into nontoxic products. It has been reported that quinones and derivatives present toxic activity against mosquito larvae Aedes aegypti.
Damião P, De Sousa, Ygor W, Vieira, Marciana P, Uliana, Manuela A, Melo, Timothy J, Brocksom, Sócrates C H, Cavalcanti   +5 more
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Aqueous Photochemistry of Methyl-Benzoquinone

The Journal of Physical Chemistry A, 2008
Chemical 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, Min, Jia, Pamela P, Vaughan, Daniel E, Falvey, Neil V, Blough   +4 more
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Benzoquinone imines. Part II. Hydrolysis of p-benzoquinone monoimine and p-benzoquinone di-imine

Journal of the Chemical Society B: Physical Organic, 1969
Kinetic studies of the hydrolysis of p-benzoquinone monoimine, over the pH range 2–10, have shown that the reaction exhibits first-order kinetics over the whole pH range. The pH dependence indicates a rate-controlling step involving the reaction of both the free imine and its protonated form with water, the latter being 1·8 × 103 more reactive than the
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