Question

What is the chemical name of ephedrine?

• A. $(1R,2S)-N-methyl-\alpha-methyl-\beta-phenethylamine$
• B. $(1R,2S)-\beta-hydroxy-N-methyl-\beta-phenethylamine$
• C. $(1R,2S)-\beta-hydroxy-N-ethyl-\alpha-methyl-\beta-phenethylamine$
• D. $(1R,2S)-\beta-hydroxy-N-methyl-\alpha-methyl-\beta-phenethylamine$

Hint:

Ephedrine = Beta-OH + Alpha-Methyl + N-Methyl.

Answer 1

The Correct Option is D

Step 1: Concept
Ephedrine is a sympathomimetic amine used as a bronchodilator and decongestant.

Step 2: Meaning
Its chemical name must reflect the phenethylamine skeleton with specific substitutions and stereochemistry.

Step 3: Analysis
Ephedrine has a hydroxy group at the beta carbon and a methyl group at both the nitrogen and the alpha carbon. The stereochemistry for the medicinal form is $(1R, 2S)$.

Step 4: Conclusion
Option D correctly identifies the substituents (beta-hydroxy, N-methyl, alpha-methyl) and the parent skeleton.

Final Answer: (D)