HAAs, also known as IQ-type or aminoimidazoazaarenes, formed at
100–200 8C, several authors suggest that they may also be formed
at higher temperatures up to 250 or even 300 8C (Jackson and
Hargraves, 1995; Arvidsson et al., 1997), and pyrolytic or non-IQtype
HAAs formed at temperatures above 200 8C (Alaejos and
Afonso, 2011).