Indirect Electrophilic Substitutions of p-Deficient Heteroaromatics to Prepare
Novel Compounds for High-Tech Applications

Alan R. Katritzky, Peter Czerney, Sergey N. Denisenko, and Volker Jesser
Figure 6. UV/Vis absorption of compounds 11 / 12 at various pH 

 

 
pKa = 5.92
 

                                                11                                                     12