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An explanation of the terms electrophile and electrophilic substitution, together with a general mechanism for this sort of reaction involving benzene. (a) the comparison of the Kekule model of benzene with the subsequent (e) the mechanism of electrophilic substitution in arenes for nitration and halogenation (see also 4.1.1 h–i) (c) the mechanism for nucleophilic addition reactions of aldehydes and ketones with NaBH4 and HCN Nitrile preparation (Chemguide). 26 Sep 2017 Electrophilic Aromatic Substitution: the bonds that form and break. you to tune how electron-rich (nucleophilic) or electron-poor (electrophilic) it is. Bottom line: if we swap a hydrogen on benzene for a methyl group, theELECTROPHILIC SUBSTITUTION MECHANISMS MENU. What is electrophilic substitution? . . . Some background on benzene (including links to more detailed This statement is about the mechanism for the electrophilic substitution reaction You will find this described on the page about the nitration of benzene. 2 May 2017 The electrophilic substitution reaction between benzene and sulfuric acid Heat benzene under reflux with concentrated sulfuric acid for several hours. Jim Clark (Chemguide.co.uk) Nucleophilic Substitution Reactions 8 Aug 2017 In electrophilic aromatic substitutions, a benzene is attacked by an electrophile Since the by-product aluminum tetrabromide is a strong nucleophile, it pulls of a www.chemguide.co.uk/mechanismogenation.html 4 May 2017 In electrophilic aromatic substitutions, a benzene is attacked by an electrophile which Since the by-product aluminum tetrabromide is a strong nucleophile, it pulls of a proton from www.chemguide.co.uk/mechanismogenation.html Electrophilic substitution relies on the electrophile being attracted to the delocalised electrons in the benzene ring. But chlorine is more electronegative than carbon, and so draws electrons in the ring towards itself. It is less attractive for electrophiles, and so the reaction is slower.