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Chapter – 4 Studies on different types of reactions…..
O
OH
O O
OH
+
O O
OH
O
O
+
R
O
OH
Cl 2
Cl 2
SO 2Cl 2
SO 2Cl 2
O O
When 3-amino-4-hydroxycoumarin was reacted with nitrous acid, it
gave 3-diazo-2, 4-chromandiones. The same product was also obtained in
72% yield when sodium nitrite in dilute hydrochloric acid was added to 3amino-4-hydroxycoumarin.
294 (Fig. 4.24)
O O
OH
O O
OH
NH 2
NH 2
Cl 2
Fig. 4.23
HCl / NaNO 2
HNO 2
Fig. 4.24
Department of Chemistry, Saurashtra University, Rajkot – 360 005 212
O
Cl
Cl
O O
O
O
O
Cl
R
O
Cl
Cl
O
O
O
O O
O
N 2