Organic Name Reactions on Instagram: "The Johnson–Corey–Chaykovsky reaction cleanly forges epoxides, cyclopropanes, and aziridines by transferring a sulfonium or sulfoxonium ylide to an aldehyde, ketone, imine, or electron-poor alkene — a beautifully direct route to strained three-membered rings. Developed initially by Johnson and later refined by Corey and Chaykovsky, this transformation reshaped small-ring synthesis through its mild conditions, broad functional-group tolerance, and excellent s