Which method uses anhydrous ammonia and lithium metal?

Which method uses anhydrous ammonia and lithium metal?

• A. Red Phosphorous method
• B. Source of Red Phosphorous
• C. Birch/Nazi method
• D. Clandestine Labs

Answer: (C)

Birch reduction uses liquid ammonia as solvent and alkali metal, typically lithium, to provide solvated electrons that drive the reduction. This setup—anhydrous ammonia plus lithium metal—defines the Birch method (often referred to in shorthand as the Birch/Nazi method). The reaction conditions enable selective reductions of aromatic systems at very cold temperatures, a signature of this approach. The other options rely on different reagents (for example, red phosphorus with hydroiodic acid) or are not methods at all, so they don’t match the described combination of reagents.

Birch reduction uses liquid ammonia as solvent and alkali metal, typically lithium, to provide solvated electrons that drive the reduction. This setup—anhydrous ammonia plus lithium metal—defines the Birch method (often referred to in shorthand as the Birch/Nazi method). The reaction conditions enable selective reductions of aromatic systems at very cold temperatures, a signature of this approach. The other options rely on different reagents (for example, red phosphorus with hydroiodic acid) or are not methods at all, so they don’t match the described combination of reagents.