Making Benzocaine: The Local Anesthetic That Changed Medicine

Huge thanks to Stony Labs for sponsoring this video, use code WHEELER at checkout for 10% off your order: https://stonylab.com Discover the science behind one of the first synthetic anesthetics benzocaine and how it helped change the face of modern medicine. In this video, we dive into the full multi-step organic synthesis of benzocaine from p-toluidine, showcasing the chemistry, the historical context, and the real lab work that makes it all possible. We'll start with the acetylation of p-toluidine to form p-acetotoluidide, then oxidize that to p-acetamidobenzoic acid using potassium permanganate. After hydrolysis, we recover p-aminobenzoic acid (PABA), a valuable intermediate used in dyes, sunscreens, and pharmaceuticals. Finally, we esterify PABA to synthesize benzocaine—the local anesthetic that replaced cocaine in medical practice and helped launch an entire class of safer pain-blocking compounds. Along the way, we’ll explain every step in plain terms, walk through reaction mechanisms, troubleshoot common issues, and run instrumental analysis (GC-MS ) to verify the product. Links: SUBSCRIBE ► https://www.youtube.com/c/WheelerScie... Discord ►   / discord   Instagram ►   / wheelerscientific   eBay ► https://www.ebay.com/usr/wheelerscien... References and uses: Adams, R., Johnson, J. R., & Wilcox, C. F. (1979). Laboratory experiments in organic Chemistry. MacMillan Publishing Company. (297-298, 307-309) Chapters: 00:00 Introduction 01:45 P-Acetotoluidide 04:37 P-Acetamidobenzoic Acid. 7:15 P-Aminobenzoic Acid (PABA 09:40 Benzocaine 11:57 Analysis Thanks for watching!