- Similarities and differences in the structures of 5-bromo-6-hydroxy-7,8- dimethylchroman-2-one and 6-hydroxy-7,8-dimethyl-5-nitrochroman-2-one
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The title compounds, C11H11BrO3, (I), and C11H11NO5, (II), respectively, are derivatives of 6-hydroxy-5,7,8-trimethylchroman-2-one substituted at the 5-position by a Br atom in (I) and by a
- Goswami, Shailesh K.,Hanton, Lyall R.,McAdam, C. John,Moratti, Stephen C.,Simpson, Jim
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p. 407 - 411
(2013/07/11)
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- Solid state redox chemistry of hydroquinones and quinones
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Solid state ceric ammonium nitrate (CAN) oxidation of hydroquinones to the corresponding quinones, gives best results when operating with ultrasonic irradiation. Nitrogen dioxide plays a key role in these 'solid-solid' oxidations. The oxidation of hydroquinones to quinones can also be achieved in a unique 'solid-solid-solid' reaction, i.e., by using a limited amount of CAN in the presence of a full equivalent of a solid cooxidant such as KBrO3. Reduction of quinones with sodium dithionite in the solid state gives rise to the corresponding highly colored quinhydrones and, eventually, to hydroquinones.
- Morey,Saa
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p. 105 - 112
(2007/10/02)
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- Oxidation Using Quaternary Ammonium Polyhalides. VIII. Oxidation of 1,4-Benzenediols with Benzyltrimethylammonium Tribromide
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The reaction of 1,4-benzenediols with 1.1 equiv of benzyltrimethylammonium tribromide in dichloromethane in the presence of aqueous sodium acetate at room temperature gave 2,5-cyclohexadiene-1,4-diones in good yields.On the other hand, the reaction of 1,4-benzenediols with a large excess of the reagent in aqueous acetic acid at 40-60 deg C gave polybromo-substituted 2,5-cyclohexadiene-1,4-diones in good yields.
- Kajigaeshi, Shoji,Morikawa, Yukihiro,Fujisaki, Shizuo,Kakinami, Takaaki,Nishihira, Keigo
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p. 336 - 338
(2007/10/02)
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