Hydrochloric Acid → Furaneol
Reaktionsgleichung
[OH-].[Na+].[CH3:3][C:4]1[O:8][C:7]([C:9](OC)=O)=[C:6]([OH:13])[C:5]=1[OH:14].CC1OC(C(OCC)=O)=C(O)C=1O.S(OC)(OC)(=O)=O.Cl>O>[CH3:3][CH:4]1[C:5](=[O:14])[C:6]([OH:13])=[C:7]([CH3:9])[O:8]1[OH-].[Na+].[CH3:3][C:4]1[O:8][C:7]([C:9](OC)=O)=[C:6]([OH:13])[C:5]=1[OH:14].CC1OC(C(OCC)=O)=C(O)C=1O.S(OC)(OC)(=O)=O.Cl>O>[CH3:3][CH:4]1[C:5](=[O:14])[C:6]([OH:13])=[C:7]([CH3:9])[O:8]1A solution of 32 g of sodium hydroxide and 33 g of a mixture containing 37.1% of methyl 5-methyl-3,4-dihydroxy-2-furoate and 52.1% of ethyl 5-methyl-3,4-dihydroxy-2-furoate in 320 ml of water was allowed to stand at room temperature for 20 hours. To the resulting mixture is added at 0° C. in one hour 25.2 g of dimethyl sulphate followed by an additional stirring period of three hours at 0° C. The pH of the solution was adjusted to 6.5 by the addition of concentrated hydrochloric acid solution. Extraction with methyl t-butyl ether yielded 18.1 g of 2,5-dimethyl-4-hydroxy-3[2H] furanone of 88.8% purity (molar yield 76.6%).
Wird geladen…
