SEARCH Articles Figures Tables Electrophiles reactivity Electrophilic Substitution Reactivity Electrophilic reactivity Electrophilic substitution relative reactivities Indole 2,3-substituted Indole electrophilic substitution Indole reactivity Indoles electrophilic substitution, relative Indoles reactivity Indoles substitution Indoles, electrophilic substitution Reactive electrophiles Reactivity electrophilicity Reactivity relative reactivities Reactivity substitution Relative reactivities