Reactive Dyes

Nucleophilic addition
DYE
O
S
O
H H
-
O
C C OSO 3
Na
DYE S CH
H H
O
CH 2
DYE
O
S
O
-
CH
H
C
H
O
Cellulose
+
NaHSO 4
DYE S
Cellulose O -
O
O
CH
+
CH 2
H 2
O
DYE
O
S
O
H
C
H
H
C
H
O
Cellulose
+ OH-
ß-elimination of ß-sulphatoethylsulphone to
vinyl sulphone and reaction with cellulose.
Nucleophilic
substitution
Reactive
group
The reactive groups is usually a
halogenated heterocyclic group
Cl
N
Cl
N
N
e.g.
a dichloro-s-triazine reactive
group
14