42035-04-1Relevant articles and documents
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.
Mechanism of acid-catalysed decomposition of 3-alkyl-1,3-diphenyltriazenes by trichloroacetic acid in hexane
Pytela, Oldrich,Bednar, Roman,Kavalek, Jaromir
, p. 343 - 349 (2007/10/03)
Eight 3-alkyl-1,3-diaryltriazenes with methyl, ethyl, propyl, butyl, pentyl, isopropyl, sec-butyl and cyclohexyl substituents were synthesized and their rate constants of decomposition by trichloroacetic acid (0.01-0.25 mol dm-3) in hexane at 25°C were measured. The kinetic model and mechanism thereof were studied by modelling of the dependences of k obs on the concentration of trichloracetic acid. On the basis of this kinetic model and the interpretation of solvent effects, a reaction mechanism was suggested according to which the triazene reacts with monomer and obviously also opens the dimer of trichloroacetic acid in a single reaction step. At the same time, a non-reactive associate between the N1 nitrogen of triazene and two molecules of trichloroacetic acid is formed in the reaction mixture. The equilibrium and rate constants depend on the addition of trichloroacetic acid as the co-solvent. Copyright
KINETICS OF ACID CATALYZED DECOMPOSITION OF SUBSTITUTED 1,3-DIPHENYL-3-METHYLTRIAZENES
Svoboda, Petr,Pytela, Oldrich,Vecera, Miroslav
, p. 553 - 563 (2007/10/02)
Kinetics of the acid catalyzed decomposition of fifteen 1-substituted-1,3-diphenyl-3-methyltriazenes have been studied in 40percent aqueous ethanolic buffers at 25 deg C.The slope found for the dependence logkobs vs pH of the buffer is not equa
1,3-Diaryltriazenes: A new class of anorectic agents
Hill,Stanley,Karoglan Williams,Loev,Fowler,McCafferty,Macko,Berkoff,Ladd
, p. 865 - 869 (2007/10/02)
A series of substituted 1,3-diaryltriazenes has been synthesized and tested for anorectic activity. Several members of the series were effective; one compound, 1,3-bis[2-cyano-5-(trifluoromethyl)phenyl]triazene, was particularly active, causing weight los