- Experimental and theoretical studies of azo derivatives in terms of different donors, acceptors and position isomerism: Synthesis, characterization and a combined electronic absorption, electrochemical and DFT study
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Eight azo derivatives with two donor groups- diphenylamine and N,N-dimethylphenyl, and four acceptor groups - 3-nitrophenyl, 4-nitrophenyl, 4-phenylcarboxylic acid, and 3-phenylcarboxylic acid, were synthesized and characterized using 1H-NMR an
- Mohan A, Keerthi,Purushothaman, Aiswarya,Janardanan, Deepa,Haridas, Karickal R.
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- Reactions of aromatic nitro compounds: LXXIV.* azo coupling of anionic nitroarene σ-complexes with aromatic diazo compounds. Effect of reaction conditions on the yield of nitroazobenzenes
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Effect of a number of factors on the yield of nitroazobenzenes in the reaction of 4-nitro-and 4-dimethylaminobenzenediazonium tetrafluoroborates with anionic σ adducts derived from 1,3-dinitrobenzene was studied. Conditions were found which allow nitroazobenzenes to be prepared in 80-90% yield.
- Blokhina,Shakhkel'dyan,Atroshchenko,Alifanova,Gitis,Kaminskii,Moiseev
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p. 401 - 403
(2007/10/03)
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- Reactions of aromatic nitro compounds: LXXIII. Reaction of anionic m-dinitrobenzene σ-complexes with arenediazonium salts
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Anionic σ-complexes derived from 4-and 5-substituted 1,3-dinitrobenzenes react with arenediazonium salts to give the corresponding nitroazobenzenes as a result of replacement of one nitro group.
- Atroshchenko,Blokhina,Shakhkel'dyan,Grudtsyn,Gitis,Borbulevich,Blokhin,Kaminskii,Shishkin,Andrianov
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p. 684 - 692
(2007/10/03)
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- Synthesis of new azo dyes under phase-transfer catalysis
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New azo dyes that do not enter into azo coupling reactions under classical conditions (water solutions, polar organic solvents) were prepared by nontraditional method (in solutions in 1,2-dichloroethane and chloroform and in water emulsions thereof) with the use of phase-transfer catalysts (dibenzo-18-crown-6, benzyltrimethylammonium chloride, sodium 4-dodecylbenzenesulfonate). The azo dyes obtained: 4-(3-nitrophenylazo)-1-bromo-2-methoxynaphthalene, 4-(3-methylphenylazo)-1-bromo-2-methoxynaphthalene, 3-nitrophenylazochrysene, 3-methylphenylazochrysene were produced in high yields and showed good processing properties.
- Chirakadze,Elizbarashvili,Baidoshvili
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p. 1642 - 1645
(2007/10/03)
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- Reactions of Aromatic Nitrocompounds. LXXII. Anionic σ-Complexes of Nitroarenes in the Azocoupling Reaction
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In reaction of KBH4 with m-dinitrobenzene in acetonitrile a mixture of isomeric anionic σ-complexes is formed. The reaction of the latter with phenyldiazonium tetrafluoroborates RC6H4N2+BF4
- Blokhina,Atroshchenko,Gitis,Blokhin,Grudtsyn,Andrianov,Kaminskii
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p. 499 - 501
(2007/10/03)
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- Steric Effects in 4-Dimethylaminoazobenzenes and Their Protonated Species
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The effects of steric crowding in the amino-substituted ring of the 4-dimethylaminoazobenzene system have been examined by electronic absorption spectroscopy, using methyl substituents to induce loss of planarity.The most significant effects are produced by methyl groups ortho to the amino group.No evidence for electronic buttressing could be found in the case of dyes with electron withdrawing groups in the second benzene ring.The effects of steric crowding in the protonated forms of the dyes have also been examined.
- Griffiths, John,Roospeikar, Ehizan,Thomasson, Jeffrey
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p. 3722 - 3739
(2007/10/02)
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