A formylation reaction of this type in which the reactant is treated with hexa-methylene-tetramine in an acidic catalyst is named for Duff. The iminium cation produced in the first step of the Vilsmeier-Haack reaction then undergoes a reaction of this type. A carbocation historically known as the sigma complex or Wheland intermediate forms during this type of reaction. Sulfuric acid catalyzes a (*) nitration in a commonly-taught example of these reactions. Different substituents in these reactions are either ortho/para or meta-directing. A Lewis acid catalyst such as aluminum chloride is used in a reaction of this typ
A formylation reaction of this type in which the reactant is treated with hexa-methylene-tetramine in an acidic catalyst is named for Duff. The iminium cation produced in the first step of the Vilsmeier-Haack reaction then undergoes a reaction of this type. A carbocation historically known as the sigma complex or Wheland intermediate forms during this type of reaction. Sulfuric acid catalyzes a (*) nitration in a commonly-taught example of these reactions. Different substituents in these reactions are either ortho/para or meta-directing. A Lewis acid catalyst such as aluminum chloride is used in a reaction of this type that broadly comes in acylation and alkylation types. For 10 points, name these reactions, such as one named for Friedel and Crafts, in which a substance attracted to electrons replaces hydrogen on an aromatic ring.
A formylation reaction of this type in which the reactant is treated with hexa-methylene-tetramine in an acidic catalyst is named for Duff.
electrophilic aromatic substitution [or EAS; or electrophilic substitution; prompt on "substitution"; prompt on Friedel-Crafts acylation or alkylation even though those don't apply to everything] 