- 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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- NITROPHENOL COMPOUND AND METHOD FOR PRODUCING THE SAME
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PROBLEM TO BE SOLVED: To provide an azo bond-free red pigment free from the risk that toxic organic amines are discharged into the environment by decomposition or the like. SOLUTION: Provided is a nitrophenol compound represented by formula (1)(R2a/
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Paragraph 0064; 0065
(2017/03/24)
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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 catalyzed by divanadium-substituted molybdophosphoric acid, H5[PMo10V2O 40]
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The nitration of aromatic compounds was carried out in the presence of divanadium-substituted molybdophosphoric acid, H5PMo 10V2O40, as catalyst and a mixture of nitric acid and acetic anhydride as nitrating agent. In the presence of this heteropolyacid the ortho- and para-nitro compounds were obtained in good to excellent yields under mild reaction conditions. Springer-Verlag 2007.
- Heravi, Majid M.,Bakhtiari, Khadijeh,Benmorad, Tina,Bamoharram, Fatemeh F.,Oskooie, Hossein A.,Tehrani, Maryam H.
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p. 449 - 452
(2008/02/02)
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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-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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- 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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- 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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