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Table 1 Substituents to the diazo salts reacted with Naphthol AS-G

From: The synthesis characterization of historical novel azo pigments: implications for conservation science

Substituent 2

Substituent 1

2-NO2−

2-CH3, 5-Cl-

2,5-di-Cl

2,4-di-NO2

4-OCH3

3-CN

4-CF3

2-NO2−

X

      

2-CH3, 5-Cl-

X

X

     

2,5-di-Cl

  

X

    

2,4-di-NO2

  

X

X

   

4-OCH3

  

X

X

X

  

3-CN

  

X

X

X

X

 

4-CF3

  

X

X

X

X

X