Fries Rearrangement

The video explains the Fries rearrangement, a reaction named after Karl Fries, involving the rearrangement of aryl esters to form ortho and para products. It discusses the role of Lewis and Bronsted-Lowry acids, the reaction's reversibility, and the mechanism involving acylium ions. Crossover studies show intermolecular reactions, and the reaction's industrial applications are limited by harsh conditions. The anionic Fries rearrangement achieves ortho selectivity using strong bases, with applications in various substrates.

Who is credited with the discovery of the Fries rearrangement?

• Linus Pauling

• Marie Curie

• Karl Fries

• Albert Einstein

Which type of acid is primarily involved in the Fries rearrangement?

• Lewis acid

• Sulfuric acid

• Phosphoric acid

• Nitric acid

What is the primary site of complexation for the acid in the Fries rearrangement?

• Nitrogen atom

• Carbonyl oxygen

• Phenol oxygen

• Hydrogen atom

What type of studies help determine the intermolecular nature of the Fries rearrangement?

• Thermodynamic studies

• Spectroscopy studies

• Kinetic studies

• Crossover studies

What is a limitation of the Fries rearrangement in industrial applications?

• Low cost

• Harsh conditions

• Mild conditions

• High selectivity

Which base is used in the anionic Fries rearrangement for ortho-directed metalation?

• Ammonia

• Potassium carbonate

• Butyllithium

• Sodium hydroxide

What is the temperature condition for the anionic Fries rearrangement to achieve ortho-lithiation?

• 50 degrees Celsius

• 100 degrees Celsius

• Room temperature

• Negative 78 degrees Celsius