CĂRȚI ÎN ENGLEZĂ ÎN LEGĂTURĂ CU «DIAZOTISATION»
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HN02 Af-H Ar-NH2 ▻ Ar-N=N ▻ Ar- N=N-Ar" Diazotisation Azo coupling Scheme
3.2 The synthesis of azo colorants two-stage reaction sequence: diazotisation
and azo coupling, as illustrated in Scheme 3.2. The first stage, diazotisation, ...
R. M. Christie, Royal Society of Chemistry (Great Britain), 2001
2
Organic Reactions: Mechanism With Problems
33. DIAZOTISATION. (OR. GRIESS). REACTION. Conversion of p-amino group
into diazo group by HN02 or NaNOz/ conc. HC1 at 0-5°C is known as
diazotisation or Griess reaction. Although aliphatic diazonium compounds readily
...
3
Speciality Chemicals: Innovations in Industrial Synthesis ...
Consecutive diazotisation and fluorination is also possible. Multiple fluorination
in a single stage is difficult by either method, multiple diazotisation giving very
poor yields. A wide variety of inexpensive anilines are available, nitration/
reduction ...
4
Synthetic Organic Chemistry: (For Honours & Post-Graduate ...
Methods of diazotisation (i) Direct method. Direct diazotisation involves (i)
treatment of one mole of the aromatic amine with about 3 moles of hydrochloric
acid, (ii) addition of ice to lower the temperature to 0— 5°C, and (iii) addition of
sodium ...
5
Handbook of Textile and Industrial Dyeing: Principles, ...
NaNO2 + HCl = HNO2 + NaCl R-NH3+Cl– + HNO2 = R-N2+ Cl– [19.2] Formation
of a clear final solution and the absence of froth indicate successful diazotisation.
The diazonium salt is unstable even at room temperature in that it reacts with ...
6
Heterocyclic Chemistry At A Glance
... ring synthesis 130 a 2-amino-, diazotisation 129, 130 2-amino-6-(1,2,4-triazol-
4-yl)-, N-9–alkylation 127 6-amino-, diazotisation 129 a 6-amino-, from Dimroth
rearrangement 124 a 6-amino-, side-chain N-alkylation 129 a 2-amino-6-chloro-,
...
John A. Joule, Keith Mills, 2012
Hence different methods have been developed for diazotisation. (a) Direct
method: A solution of one mole of aromatic amine in three moles of hydrochloric
aicd is cooled to, 273 K and then calculated amount of a nitrite solution is added.
8
Heteroaromatic Nitrogen Compounds: The Azoles
The diazotisation of aminoazoles has received considerable attention.
Aminopyrazoles yield typical diazonium salts with isoamyl nitrite [432c] or with
nitrous acid[70c,83e,3217,330k,392m,419e,431c,552e,77l,957b, 962e,1019b,1
167,1 193c ...
Kenneth Schofield, M. R. Grimmett, Brian Richard Thornton Keene, 1976
9
T.B. Of Organic Chemistry (M.E.)
NO2 N2+cr NaN02/HCI^ If)) H3P°2 0-5°C Nitrobenzene Benzene (82)
lodobenzene from benzene (I1T-JEE) Key step is diazotisation of aniline followed
by treatment with KJ. Direct iodination of benzene is not possible. NO, HN03
H2SO4' ...
10
Objective Chemistry For Iit Entrance
Which of the following precautions must be taken during diazotisation ? (a) It
must be carried out at low temperature (b) An excess of HCI must be used to
prevent coupling reaction (c) An excess of HN02 must be avoided (d) All 400.
Aniline ...
