Electrophilic Reaction - Electrophilic Reaction

Japanese: 求電子反応 - キュウデンシハンノウ

A type of ionic reaction. It is also called an electrophilic reaction or a cationoid reaction. Generally, the main step in the reaction is when an electrophilic reagent, such as a cation (hydrogen ion H ⁺ or nitronium ion _NO2 ⁺ ) or a Lewis acid (aluminum chloride _AlCl3 or boron fluoride _BF3 ), attacks the unsaturated bond or unshared electron pair of the substrate. Electrophilic reactions are broadly divided into (1) electrophilic substitution reactions, in which (part of) the reagent replaces part of the substrate, and (2) electrophilic addition reactions, in which the reagent adds to a multiple bond of the substrate.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

イオン反応の一種。親電子反応，カチオノイド反応cationoid reactionともいう。一般に陽イオン(水素イオンH^＋やニトロニウムイオンNO₂^＋など)やルイス酸(塩化アルミニウムAlCl₃やフッ化ホウ素BF₃など)の求電子試薬が基質の不飽和結合や非共有電子対を攻撃する段階が反応の中心となる。　求電子反応は，(1)試薬(の一部)が基質の一部と置換する求電子置換反応と，(2)試薬が基質の多重結合に付加する求電子付加反応に大別される。

出典　株式会社平凡社世界大百科事典第２版について　情報

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