Main uses: it is an important intermediate for the synthesis of vitamin B, and also for the synthesis of 3,4-disubstituted pyridines and 5,4-disubstituted pyridines-（ β- Hydroxyethyl) - 4-methylthiazole intermediate.
Production method:
1、 γ- Butyrolactone was synthesized by Claisen condensation with vinyl acetate.
2. Ethyl acetoacetate (or methyl acetoacetate) is prepared by condensation with ethylene oxide.
