An electrophile (electrophilic reagent) is an electron-pair acceptor, that is, a Lewis acid, that is attracted to regions of high electron density. The word means 'electron-loving', reflecting this attraction. Electrophiles are attacked by nucleophiles, accepting an electron pair to form a new bond.

亲电试剂是接受电子对的物质,即路易斯酸,它被高电子密度的区域所吸引。该词意为“喜爱电子”,反映了这种吸引。亲电试剂被亲核试剂进攻,接受一对电子以形成新键。