organic intermediate 7331-52-4

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(S)-3-Hydroxy-gamma-butyrolactone CAS:7331-52-4 is activated through reaction with a sulfonyl chloride, ring-opened in acid water solution, and produced in alkali solution into (R)-3,4-poxy butyrate, which is then reacted with 25% concentration water solution of trimethylamine to produce L-carnitine.