41. See, for example, Electrophilic addition. 42. N-fluoropyridinium ions and iminium ions can also be used as electrophilic fluorinating reagents. 43. For instance, the page dealing with electrophilic substitution could benefit from showing a mechanism. 44. TRPA1 is a nociceptor that integrates many noxious environmental stimuli including oxidants and electrophilic agents. 45. This is different from an electrophilic aromatic substitution reaction in which nitronium ions are the electrophile. 46. Electrophilic attack to an aromatic system results in electrophilic aromatic substitution rather than an addition reaction.47. Electrophilic attack to an aromatic system results in electrophilic aromatic substitution rather than an addition reaction. 48. Norbornene is commonly used in transition metal catalysis to effect the migration of electrophilic transition metals. 49. For example, electrophilic aromatic substitutions involves a distinct intermediate and two less well defined states. 50. Just as in electrophilic aromatic substitution, Activating groups such as methoxy improve yield and selectivity: 