29128-56-1Relevant academic research and scientific papers
Synthesis, structural characterization and antimicrobial activities of triorganotin(IV)azo-carboxylates derived from ortho/para-amino benzoic acids and β-naphthol
Debnath, Paresh,Das, Ankit,Singh, Keisham Surjit,Yama, Tage,Singh, S.Sureshkumar,Butcher, Ray J.,Sieroń, Les?aw,Maniukiewicz, Waldemar
, (2019/10/02)
Triorganotin (IV) complexes 1–3 were synthesized by the reaction of azo-carboxylic acid viz. 2/4-(2-hydroxynaphthylazo)benzoic acids with appropriate triorganotin(IV) chlorides [R = Me (compounds 1 and 2) and Bu (compound 3)] in presence of triethyl amine
Convenient and rapid diazotization and diazo coupling reaction via aryl diazonium nanomagnetic sulfate under solvent-free conditions at room temperature
Koukabi, Nadiya,Otokesh, Somayeh,Kolvari, Eskandar,Amoozadeh, Ali
, p. 12 - 17 (2015/10/05)
For the first time, nanomagnetic-supported sulfonic acid is used for conversion of several types of aromatic amine, containing electron-withdrawing groups as well as electron-donating groups to the corresponding azo dyes in excellent yield. The synthesis of these compounds is described by the sequential diazotization-diazo coupling of various aromatic amines with sodium nitrite, nanomagnetic supported sulfonic acid and coupling agents under solvent-free conditions at room temperature. This new method offers several advantages including short reaction time, mild reaction conditions, avoidance of harmful acids, and simple work-up procedure. More importantly, aryldiazonium salts supported on magnetic nanoparticles (aryl diazonium nanomagnetic sulfate) were sufficiently stable to be kept at room temperature in the dry state.
The in situ generation and reactive quench of diazonium compounds in the synthesis of azo compounds in microreactors
Akwi, Faith M.,Watts, Paul
, p. 1987 - 2004 (2016/10/05)
In this paper, a micro-fluidic optimized process for the continuous flow synthesis of azo compounds is presented. The continuous flow synthesis of Sudan II azo dye was used as a model reaction for the study. At found optimal azo coupling reaction temperature and pH an investigation of the optimum flow rates of the reactants for the diazotization and azo coupling reactions in Little Things Factory-MS microreactors was performed. A conversion of 98% was achieved in approximately 2.4 minutes and a small library of azo compounds was thus generated under these reaction conditions from couplers with aminated or hydroxylated aromatic systems. The scaled up synthesis of these compounds in PTFE tubing (i.d. 1.5 mm) was also investigated, where good reaction conversions ranging between 66-91% were attained.
Substituent effect on the tautomerization of 1-arylazonaphthalen-2-ols by mass spectrometric analysis
Lin, Shaw-Tao,Lin, Lee-Hui,Lin, Yi-Cang,Ding, Mei-Fan
, p. 257 - 262 (2015/03/31)
An electron-ionization (EI) mass spectra of a series of 1-arylazonaphthalen-2-ols was obtained for studying the substituent effect on the fragmentation. The correlation between the ratio, molecular ion and fragment ion, and Hammett's constants is applied to examine the effect of the substituent on the fragmentation. The negative correction between the ratio, Imolecular ion/(I171amu + I143amu + I115amu), and Hammett's constants indicates an electron-withdrawing group destabilized the molecular ion. An unusual long-range hydrogen transfer demonstrates an important role in the fragmentation process Mass spectra of a series of 1-arylazonaphthalen-2-ols were obtained for studying the substituent effect on the fragmentation. The correlation between the ratio of molecular ion and fragment ion, and Hammett's constants is applied to examine the effect of substituent on the fragmentation. The negative correction indicates an electron-with-drawing group destabilized the molecular ion. An unusual long-range hydrogen transfer demonstrates an important role in the fragmentation process.
A new nano silica gel supported by thionyl chloride as a solid acid for the efficient diazotization of aniline derivatives: Application and synthesis of azo dyes
Mirjalili, Mohammad,Zahed, Fatemeh,Hassanabadi, Alireza
experimental part, p. 1042 - 1046 (2012/06/16)
A new nano silicagel supported by thionyl chloride as a solid acid was synthesized and used as a increasing the production yield of dye to affect the efficient diazotization of arylamines. The diazonium salts thus obtained were coupled, using standard exp
Synthesis and application of 2-nitro-2′,4′-dihydroxyazobenzene, 4-nitro-2′,4′-dihydroxyazobenzene and 2-carboxy-2′- hydroxyazonaphthol for dyeing of jute fabric
Sarkhel, Jayanta,Chattopadhyay,Bhaduri,Deb, Tathagata,Pandey, Kalyan,Saha
, p. 1020 - 1023 (2008/12/21)
The following three azo dyes namely, 2-nitro-2′,4′- dihydroxyazobenzene (I), 4-Nitro-2′,4′-dihydroxyazobenzene (II) and 2-carboxy-2′-hydroxyazonaphthol (III) have been synthesized and characterized. These three azo dyes have been successfully applied for dyeing of bleached jute fabric in alkaline medium following the conventional exhaust method. The performance of the dyes are evaluated by evaluating the colour yield and wash fastness of the dyed fabric samples'.
Synthesis of dyes from aromatic C-nitroso-N-hydroxytriazenes
Churkina,Belyaev,Kazak
, p. 680 - 682 (2007/10/03)
Aromatic C-nitroso-N-hydroxytriazenes can be used as stable forms of diazo compounds for preparation of azo dyes.
Aryne formation from 1-(3′-Carboxyaryl)-3,3-dim ethyl trianzenes
Christopher Buxton,Heaney, Harry
, p. 3929 - 3938 (2007/10/02)
A study of the decomposition of 1-(2′-carboxyphenyl)-3,3-dimethyltriazene and the tetrabromoand tetrachloro- analogues showed that the arenediazonium-2-carboxylates were intermediates in the formation of the corresponding arynes: the 1-(2′-carboxyteirahalophenyl)-3,3-dimethyltriazenes are stable precursors that enable cycloaddition reactions of the tetrahalobenzynes to be carried out in acceptable yields using substrates such as N-methylpyrrole,p-xylene and m-dimethoxybenzene.
COORDINATION CHEMISTRY OF SOME AZO COMPOUNDS. 2-CARBOXYPHENYL AZO-β-NAPHTHOL AND 4-CARBOXYPHENYL AZO-β-NAPHTHOL COMPLEXES WITH IRON(III), IRON(II), COBALT(II), NICKEL(II) AND COPPER(II) IONS
Goher, Mohamed S.,Masoud, Mamdouh S.,Heiba, Ahmed M.
, p. 1491 - 1501 (2007/10/02)
The reaction of 2-carboxyphenyl azo-β-naphthol (H2L) and 4-carboxyphenyl azo-β-naphthol (H2), with Fe(II), Co(II), Ni(II) and Cu(II) ions resulted in formation of ML*nH2O and M*nH2O complexes (n = 1, 2, 3 or 4).In the case of Fe(III), a complex of F
