Patent ID: 8822706
Filing Date: 2014-09-02
Classification: C07C,C07D

Abstract:
1. A method for preparing 2-hydroxybutyrolactone (2HBL) from a compound, or from its salt or its oligomers, said compound fitting formula (I) wherein R1 represents H R2 represents OH; or R1 and R2 together represent ═O; R3 represents COOH or COO—CH(CH method according to which a sulfonium of said compound is obtained, said sulfonium fitting the formula (II) wherein R1, R2 and R3 have the above definition, and R6 and R7 are selected independently of each other from H and linear, cyclic, alicyclic or branched alkyl groups having from 1 to 10 carbon atoms; R8 is selected from H, CH3, phenyl, COOH, and linear, cyclic, alicyclic or branched alkyl groups having from 1 to 10 carbon atoms, and the thereby obtained sulfonium is hydrolyzed, and 2,4-dihydroxybutyric acid or its salt is cyclized into 2 hydroxybutyrolactone.