Dihydro-3-(2-methoxyethyl)-2(3H)-furanone → 2H-Pyran-4-carboxylic acid, tetrahydro-, methyl ester
Reaktionsgleichung
[CH3:1][O:2][CH2:3][CH2:4][CH:5]1[CH2:9][CH2:8][O:7][C:6]1=[O:10]>CO>[O:2]1[CH2:3][CH2:4][CH:5]([C:6]([O:7][CH3:8])=[O:10])[CH2:9][CH2:1]1.[CH2:4]1[C:5]2([CH2:9][CH2:8][O:7][CH2:6]2)[C:3]1=[O:2]Komponenten
4
Edukt 1
Produkt 2
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
During an experimental period of 36 h a total of 900 g of a solution consisting of 53 wt % of 3-(2'-methoxyethyl)-dihydro-2(3H)furanone and 47 wt % of methanol was evaporated and the vapors were passed over 90 g of aluminum oxide catalyst (diameter 1.5 ram) at a temperature of 250° C. in a tubular reactor. Following condensation of the gaseous effluent, analysis was effected using gas chromatography. The conversion of 3-(2'-methoxyethyl)-dihydro-2(3H)furanone was 53%. 46 mol % of methyl tetrahydropyran-4-carboxylate and 7 mol % of 5-oxaspiro-[2.4 ]heptan-2-one were formed.