SEARCH Articles Figures Tables Alkyl-substituted azulenes Azulene Azulene electrophilic substitution Azulene substitution reactions Azulene, substitution Azulene, substitution Azulene-substituted thiophenes Azulenes Azulenes, electrophilic substitution Azulenes, electrophilic substitution reactions Di-substituted azulenes Mono-substituted azulenes Tetra-substituted azulenes