Question

1. Provide a reasonable mechanism to account for the following reaction.

NO2 H2SO4 HNO;

3. Propose a reasonable mechanism for the following reactions.

7.   Propose a mechanism for the formation of the following products.

Answer 1

These are awesome problems of Organic Reaction Chemistry regarding Aromatic Electrophilic Substitution reactions, I provide a detailed solution with the mechanism as given below, Hope this will help you.

NO2 H2SO4 HNO3 Nitration. This is Aromatic Electrophilic Substitution Reaction. Mechanism: - Generation of Electrophile at @ HO H₂SO4 + HNO3 [ӨН,о oo H No, (Electrophile H NOZ (7 -NO2 -40 IGNOL → Aromatisation *- complex o-comples of the (Product) ring

(3 Br Br i + AICI: CI & Friedel-Craft Aeylation Reaction. an This is Aromatie Electrophilic substitution Reaction. Mechanism: - Generation of Electrophile at o Alely Đ Alels (Lewis Acid) Jo > Bo (Electron donating (Electrophile) nature activates the ring at O'A p position) : Br T-complex (Steric factor at "o' position favours the up attack.) 0 6- complex Bro (Product)

- Br FeBiz Friedel Craft Alkylation ( Aromatic Electrophilic substitution) * Mechanism: Generation of Electrophile : Febrez + Febrz (Lewis. Aeid) G Brzfe- f Electrophile. + a Electrophile. tj substitution of fleetro phile on Benzene oecuss through the similar mechanism Shown in 8.14 8.3. (Product)

AICI: a Friedel-craft Alkylation This is also reaction. Generation of Electrophile & el + Alel Felicia Electrophiles:-), 1+ allylic (3° + allylic දඬ © (Stable than io o & substitution of Electrophiles on Benzene occurs through the similar mechanism Shown in 8.14 8.3.

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