- Crossing the insulator-to-metal barrier with a thiazyl radical conductor
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The layered-sheet architecture of the crystal structure of the fluoro-substituted oxobenzene-bridged bisdithiazolyl radical FBBO affords a 2D π-electronic structure with a large calculated bandwidth. The material displays high electrical conductivity for
- Mailman, Aaron,Winter, Stephen M.,Yu, Xin,Robertson, Craig M.,Yong, Wenjun,Tse, John S.,Secco, Richard A.,Liu, Zhenxian,Dube, Paul A.,Howard, Judith A. K.,Oakley, Richard T.
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Read Online
- Nitrogen Oxides and Nitric Acid Enable the Sustainable Hydroxylation and Nitrohydroxylation of Benzenes under Visible Light Irradiation
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A new type of waste recycling strategy is described in which nitrogen oxides or nitric acid are directly employed in photocatalyzed hydroxylations and nitrohydroxylations of benzenes. Through these transformations, otherwise costly denitrification can be combined with the synthesis of valuable compounds for various applications.
- Hofmann, Laura Elena,Mach, Leonard,Heinrich, Markus R.
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supporting information
p. 431 - 436
(2017/12/15)
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- A Synthetic Pathway to Substituted Benzofuroxans through the Intermediacy of Sulfonates: The Case Example of Fluoro-Nitrobenzofuroxans
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Benzofuroxans are well known compounds that continue to attract particular attention since the discovery of 4,6-dinitrobenzofuroxan (DNBF) back in 1899. It has been shown that these compounds possess biological activities that are related to their electro
- Jovené, Cyril,Marrot, Jérome,Jasmin, Jean-Philippe,Chugunova, Elena,Goumont, Régis
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p. 4084 - 4092
(2016/08/24)
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- Nitration of phenolic compounds by antimony nitrate
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Antimony nitrate is new compound to be an efficient nitration reagent in the nitration of phenolic compounds with high yields. This producerworks efficiently onmost of the examples, as a grinding nitration reaction, proceed very fast (~1 min) and thermogenic. Copyright Taylor & Francis Group, LLC.
- Jirandehi, Hassan Fathinejad,Mirzaeian, Marjan
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experimental part
p. 284 - 286
(2011/07/08)
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- Synthesis of 6-aminobenzopentathiepines by reactions of 4-nitrobenzodithiol-2-ones with NaHS
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The reactions of benzodithiol-2-ones containing a 4-nitro group with NaHS led to mixtures of 6- aminobenzopentathiepines and 4-nitrobenzotrithiols. The product ratio and yields depend on the substituent in the aromatic ring. Based on the yields of benzopentathiepines, the following series of substituent efficiency can be inferred: CF3 ? F, Cl > CN. Aminobenzopentathiepines are probably formed via the intermediate benzotrithiols; the transformation apparently starts with the reduction of the nitro group.
- Khomenko, Tatyana M.,Korchagina, Dina V.,Komarova, Nina I.,Volcho, Konstantin P.,Salakhutdinov, Nariman F.
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scheme or table
p. 193 - 197
(2012/04/05)
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- PEG-N2O4: An efficient nitrating agent for the selective mono- and dinitration of phenols under mild conditions
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N2O4 was easily impregnated on polyethyleneglycol to give a stable reagent. The polyethyleneglycol-N2O4 (PEG-N2O4) system was used as an effective nitrating agent for the nitration of phenols. Mono- and dinitrophenols can be obtained via direct nitration of phenols in the presence of PEG-N2O4 at room temperature in moderate to high yields. Copyright Taylor & Francis Group, LLC.
- Zolfigol, Mohammad Ali,Madrakian, Elaheh,Ghaemi, Ezat,Niknam, Khodabakhsh
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p. 3366 - 3374
(2008/12/22)
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- Nitration of aromatic compounds by Zn(NO3)2· 2N2O4 and its charcoal-supported system
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Zn(NO3)2·N2O4 and its charcoal supported system were found to be efficient nitrating agents. Mononitration of aromatic compounds such as benzene, alkyl benzenes, halobenzenes, nitrobenzene, anisol, and the highly selective mono-, di-, and trinitration of phenol, and dinitraion of substituted phenols were also performed in the presence of these reagents.
- Iranpoor, Nasser,Firouzabadi, Habib,Heydari, Reza,Shiri, Morteza
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p. 263 - 270
(2007/10/03)
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- Trichloroisocyanuric Acid/NaNO2/wet SiO2 as an Efficient System for the Selective Dinitration of Phenols under Solvent-free Conditions
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Dinitrophenols can be obtained via direct nitration of phenols with trichloroisocyanuric acid, NaNO2 and wet SiO2 at room temperature under solvent-free conditions with moderate to high yields.
- Zolfigol, Mohammad Ali,Madrakian, Elaheh,Ghaemi, Ezat
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p. 2222 - 2224
(2007/10/03)
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- Silica-polyethyleneglycols/N2O4 complexes as heterogeneous nitrating and nitrosating agents
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Silica-chloride was reacted with different quantities of H(OCH2CH2)nOH (n = 2-4) to furnish silica-based linear polyethylene glycols and cyclic polyethylene glycolic ethers. The N2O4 complex of silica-tetraethylene glycolic ether (III) was selected and used as a stable, cheap, and heterogeneous silica-based reagent for the selective mono- and dinitration of phenols and nitrosation of thiols.
- Iranpoor,Firouzabadi,Heydari
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p. 1027 - 1035
(2007/10/03)
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- Silica-acetate complex of N2O4: A heterogeneous reagent for the selective nitration of phenols and nitrosation of thiols
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Complexation of gaseous N2O4 with acylated silica gel affords an addition compound, which is an efficient heterogeneous reagent for the selective mono- and dinitration of phenol, substituted phenols and nitrosation of thiols.
- Iranpoor,Firouzabadi,Heydari
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p. 703 - 710
(2007/10/03)
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- Ionic complex of N2O4 with 18-crown-6: A highly efficient and selective reagent for nitration of phenols
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Interaction of gaseous N2O4 with 18-crown-6 affords the stable crystalline complex of NO+ · 18-crown-6 · H(NO3)2· This ionic complex is an efficient nitrating agent for the selective mono-, di-, and trinitration of phenol and also for the selective mono-, and dinitration of substituted phenols.
- Iranpoor,Firouzabadi,Heydari
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p. 3295 - 3302
(2007/10/03)
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- Efficient and selective mono and dinitration of phenols with Cr(No3)3. 2N2O4 as a new nitrating agent
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Cr(NO3)3.2N2O4 is easily prepared reagent for the efficient and selective mono or dinitration of phenolic compounds. High selectivity ratio of p-nitrophenol formation vs o-nitrophenol is also observed.
- Iranpoor, Nasser,Firouzabadi, Habib,Zolfigol, Mohammad Ali
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p. 2773 - 2781
(2007/10/03)
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- Dinitrogen tetroxide complexes of iron and coppernitrates as new reagents for selective mono- and dinitration of phenolic compounds
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Fe(NO3)3.1.5 N2O4 and Cu(NO3)2.N2O4 are easily prepared reagents for the efficient and selective mono- or dinitration of phenolic compounds. In comparison with metal nitrates, these complexes resemble a synergetic effect on the rates and the yields of the reactions. High ratio of p-nitrophenol formation vs o-nitrophenol is also observed in the mononitration reactions.
- Firouzabadi,Iranpoor,Zolfigol
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p. 3301 - 3311
(2007/10/03)
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- FLUORINATION OF ANIONIC ?-COMPLEXES BY CESIUM FLUOROXYSULFATE
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Anionic ?-complexes and related structures react with cesium fluoroxysulfate to give predominantly the C-fluoro derivatives: fluoronitrocyclohexadienes or substituted fluoronitrobenzenes.Oxidation or degradation of a complex to form substituted nitrobenzenes is also possible.The balance between all these processes is determined by the structure of the original complex.
- Gakh, A. A.,Romaniko, S. V.,Ugrak, B. I.,Fainzil'berg, A. A.
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p. 1432 - 1436
(2007/10/02)
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- ipso Nitration in p-halophenyl ethers
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Addition of nitronium ion ipso to halogen occurs on nitration of the p-haloanisoles in acetic anhydride at -60 deg C.In the cases of p-fluoro- and p-chloro-anisole, addition of the nitronium ion is reversible and only small amounts of ipso products are obtained.With p-bromoanisole nitrodebromination occurs.When p-halophenyl ethers containing a trapping substituent, e.g., 2-(4-chlorophenoxy)-2-methylpropanoic acid, are used as substrates, substantial amounts of the spiro diene with nitro ipso to halogen, e.g., 3,3-dimethyl-8-chloro-8-nitro-1,4-dioxaspirodeca-6,9-dien-2-one, can be isolated.The results demonstrate that extensive ipso attack at the halogen-substituted position is general in the nitration of p-halophenyl ethers.Key words: ipso nitration, ether, diene, p-haloanisole.
- Clewley, Robin G.,Fischer, Alfred,Henderson, George N.
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p. 1472 - 1479
(2007/10/02)
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- Formation of 4-Halo-4-nitrocyclohexa-2,5-dienones on Nitration of p-Halophenols and p-Halophenyl Acetates.
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Nitration of p-chloro-, p-fluoro-, and p-bromo-phenol or the corresponding p-halophenyl acetates at -40 deg C and below gives the 4-halo-4-nitrocyclohexa-2,5-dienones in addition to the 4-halo-2-nitrophenols.The dienones isomerize to the nitrophenols at temperatures between -40 deg C and 0 deg C.Nitration of 4-chloro-2-methylphenol or its acetate gives both 4-chloro-2-methyl-4-nitrocyclohexa-2,5-dienone and 4-chloro-6-methyl-6-nitrocyclohexa-2,4-dienone. 4-Chloro-3-methylphenol and its acetate give 4-chloro-3-methyl-4-nitrocyclohexa-2,5-dienone.
- Clewley, Robin G.,Cross, Gordon G.,Fischer, Alfred,Henderson, George N.
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p. 1299 - 1310
(2007/10/02)
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