Photolysis of unsymmetric azo compounds. cis Azo compound intermediates

1973 ◽  
Vol 95 (13) ◽  
pp. 4361-4367 ◽  
Author(s):  
Ned A. Porter ◽  
Lawrence J. Marnett
Keyword(s):  
Azo Compounds ◽  
Azo Compound

Reactions of Tertiary Butyl Hypochlorite. I. The Chlorination of Aromatic Nitroamines

1959 ◽  
Vol 12 (3) ◽  
pp. 430 ◽  
Author(s):  
KH Pausacker ◽  
JG Scroggie
Keyword(s):  
Azo Compounds ◽  
Direct Oxidation ◽  
Tertiary Butyl ◽  
Azo Compound

Tertiary butyl hypochlorite reacts with 2-nitroaniline, 4-nitroaniline, N-methyl-4-nitroaniline, and NN-dimethyl-4-nitroaniline to form excellent yields of nuclear-chlorinated derivatives. Direct oxidation, to form azo compounds, is also observed with 4-nitroaniline and the yield of azo compound increases at higher temperatures. Demethylation also occurs when N-methyl-4-nitroaniline and NN-dimethyl-4-nitro-aniline are used.

Depression Performance of Azo Dyes to Sulfide Minerals

2011 ◽  
Vol 287-290 ◽  
pp. 3074-3080
Author(s):  
Li Hong Lan ◽  
Jian Hua Chen ◽  
Ping Lan ◽  
Mei Lian Liang ◽  
Ye Chen
Keyword(s):  
Azo Dyes ◽  
Sulfide Minerals ◽  
Frontier Molecular Orbital ◽  
Azo Compounds ◽  
Orbital Energy ◽  
Energy Calculation ◽  
Mineral Surfaces ◽  
Good Adhesion ◽  
Azo Compound ◽  
Azo Group

Azo dyes have strong hydrophilic and good adhesion to solid surface. In this study, 23 kinds of typical azo compounds were tested as depressant of sulfide minerals. Absorption of azo compound on mineral surfaces was detected by UV. The result shows that some of them can be good depressants of single sulfide minerals. With the number of azo group increasing from 1 to 3, depression performances are improved. On the other hand, depression performances of azo dye are related to the type of group and the location of phenyls，the results of adsorption and the frontier molecular orbital energy calculation may be used to explain depression performances of azo dyes.

scholarly journals Synthesis and Characterization of New Azo Compounds Linked to 1, 8-Naphthalimide and Studying Their Ability as Acid-Base Indicators

2019 ◽  
pp. 2341-2352
Author(s):  
Suaad M.H. Al-Majidi ◽  
Mohammed G.A Al-Khuzaie
Keyword(s):  
Diazonium Salt ◽  
Coupling Reaction ◽  
Alkaline Media ◽  
Azo Compounds ◽  
Acid Base ◽  
Naphthalic Anhydride ◽  
Azo Compound ◽  
Basic Solutions ◽  
Specific Reactions

New Azo compounds containing an 1,8-naphthalimide moiety were synthesized from 1, 8-naphthalic anhydride by a reaction with p-phenylenediamine or benzidine to produce 1,8-naphthalimide derivatives (1 or 2), which were converted to diazonium salt derivatives by using sodium nitrite and acetic acid at 0-5 áµ’C. The diazonium salt was subjected to a coupling reaction with different substituted phenol in alkaline media at 0-5 áµ’c to produce azo compound derivatives (3-14). The New Azo compound derivatives (3-14) were identified by 1H-NMR, 13C-NMR, and FTIR and by measuring characteristic physical properties and specific reactions. Also, the ability of the prepared azo compounds to work as acid-base indicator was investigated, since azo dyes have different and sharp colors in acidic or basic solutions.

scholarly journals The kinetics of the thermal decomposition of benzalazine vapour

1936 ◽  
Vol 156 (888) ◽  
pp. 444-455 ◽  
Keyword(s):  
Thermal Decomposition ◽  
Boiling Point ◽  
Azo Compounds ◽  
Azo Compound ◽  
Principal Reaction ◽  
Wide Range ◽  
Reaction Proceeds ◽  
Nitrogen Bonds ◽  
Kinetics Of ◽  
Single Bonds

Ramsperger has investigated the kinetics of the thermal decomposition of a number of aliphatic azo-compounds at temperatures between 250° and 330° C. The principal reaction is in each instance of the type R. CH - N = N - CH . R ' = N 2 + x . R . CH . CH . R + x . R ' . CH . CH . R ' + (1 - 2 x ) . R . CH . CH . R ' . For a symmetrical azo-compound (R = R ' ), x = 0. When heated to about 300° C., benzalazine undergoes an analogous decomposition, mainly to nitrogen and stilbene ; but the liberation of nitrogen from benzalazine involves the rupture of two double bonds, instead of two single bonds as in the azo-compounds C 6 H 5 CH = N - N = CHC 6 H 5 = N 2 + C 6 H 5 CH = CHC 6 H 5 . A study of the kinetics of the benzalazine decomposition therefore offers the opportunity for a comparison of the breakage of the single and double carbon-nitrogen bonds. We find that the reaction can be followed manometrically at temperatures between 315° and 360° C. These temperatures lie above the boiling-point of benzalazine and stilbene (b. p. 306°), and therefore the reaction proceeds with increase of pressure over a wide range of initial concentrations.

scholarly journals SYNTHESIS OF AZO COMPOUNDS DERIVATIVE FROM EUGENOL AND ITS APPLICATION AS A TITRATION INDICATOR

2010 ◽  
Vol 9 (1) ◽  
pp. 95-98 ◽  
Author(s):  
Bambang Purwono ◽  
Catur Mahardiani
Keyword(s):  
Acetic Acid ◽  
Sodium Hydroxide ◽  
1H Nmr ◽  
Sodium Nitrite ◽  
Diazonium Salt ◽  
Azo Compounds ◽  
Chloride Salt ◽  
Acid Condition ◽  
Azo Compound ◽  
Azo Derivatives

The synthesis of azo compounds from eugenol has been carried out by diazotation reaction. The diazonium salt was produced by reaction of aniline and sodium nitrite in acid condition at 0-5 °C temperature to yield benzenediazonium chloride salt. The salt was then reacted with eugenol to produce the azo derivatives. The azo product was analyzed by IR, 1H-NMR, dan GC-MS spectrometer. The results showed that the reaction of benzenediazonium chloride with eugenol gave 4-allyl-2-methoxy-6-hydroxyazobenzene in 34.27% yield for 30 minutes reaction. The derivative of azo compound was dissolved in ethanol and then the color changing was observed in range of pH 9.8-11.1 from yellow to red. Application for titration indicator for acetic acid titrated with sodium hydroxide showed error less than 3.20% compared with phenol phtaline indicator.   Keywords: Eugenol, Azo compound, titration indicator

Azo Compounds.1An Eight-membered Cyclic Azo Compound

1959 ◽  
Vol 81 (1) ◽  
pp. 217-221 ◽  
Author(s):  
C. G. Overberger ◽  
I. Tashlick
Keyword(s):  
Azo Compounds ◽  
Azo Compound

Studies on the Possible Formation of Azo Compounds in Rumen Fluid

1969 ◽  
Vol 52 (6) ◽  
pp. 1213-1220
Author(s):  
Stanley E Katz ◽  
Carol A Fassbender ◽  
Richard F Strusz
Keyword(s):  
Rumen Fluid ◽  
Azo Compounds ◽  
Azo Compound ◽  
The Stability ◽  
Substituted Urea

Abstract Studies of the transformations of substituted urea herbicides in rumen fluid, using metobromuron as a pilot compound, indicated that one of the products is the corresponding aniline. Because it was possible for a diazotization reaction to take place from the reduction of nitrate to hydroxylamine and ammonia through a transient nitrite step, the formation of azo compounds in rumen fluid was investigated. Incubation of 3,4-dichloroaniline with rumen fluid did not result in t he formation of any measurable azo compounds. The stability in rumen fluid of a known azo compound, 3,3’,4,4’-tetrachloroazobenzene, was also studied. Evidence is presented to show that azo compounds can break down in rumen fluid.

Azo Compounds.1A Seven-membered Cyclic Azo Compound

1958 ◽  
Vol 80 (9) ◽  
pp. 2317-2321 ◽  
Author(s):  
C. G. Overberger ◽  
Joseph G. Lombardino
Keyword(s):  
Azo Compounds ◽  
Azo Compound
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