- Oxidation of Hydroquinones with Oxygen in the Presence of Bis(1,3-propanediaminato)copper(II) Chloride
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Treatment of hydroquinones such as 1,2-dihydroxybenzene, 1,4-dihydroxybenzene and its 2-methyl derivative, 1,2,4-trihydroxy-6-methylbenzene, 1,2- and 1,4-dihydroxynaphthalene with oxygen in ethanol in the presence of bis(1,3-propanediaminato)copper(II) chloride and a few drops of acetic acid effects oxidative C-C coupling plus oxidation of the hydroquinone to the quinone system to afford the corresponding biquinones in yields exceeding 75percent.
- Paraskevas, Spyridon M.,Konstantinidis, Demetrios,Vassilara, Georgia
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- An efficient synthesis of oosporein
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Fungal metabolite oosporein was prepared in four steps and 24% overall yield starting from 2,5-dimethoxytoluene. It was demonstrated that treatment of phoenicin with pyrrolidine and copper(II) acetate led to oosporein, whereas similar treatment of the isomeric 'isophoenicin' produced a benzofuran diquinone. No chromatography was required during any step of the synthesis.
- Love, Brian E.,Bonner-Stewart, Jeffrey,Forrest, Lori A.
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supporting information; experimental part
p. 5050 - 5052
(2009/12/05)
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- Rust disease control by Aphanocladium album and/or Beauveria brongniartii
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There is disclosed a method and composition for controlling rust disease in plants. Metabolites produced by Aphanocladium album mycoparasites are recovered and applied in an effective amount to plants at risk for acquiring rust disease More specifically,
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Page/Page column 18
(2010/11/27)
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- Kinetics of oxidative coupling of phenols. Oxidation of resorcinols by alkaline hexacyanoferrate(III)
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The reactions of resorcinol and 5-methylresorcinol(orcinol) with alkaline hexacyanoferrate(III), at constant ionic strength, gave coupled products.The rate of the reaction was dependent on the first powers of the concentrations of each component - substrate,oxidant and alkali.The reaction pathway was via the formation of a radical intermediate, which was detected by esr spectroscopy, and showed an absorption at 650 nm in the visible region, and a typical absorption band at 1560 cm-1 in the infrared spectrum.
- Bhattacharjee, Mitra,Mahanti, Mahendra K.
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p. 225 - 228
(2007/10/02)
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