Diketene → HCID 20360652, Verbindung
Reaktionsgleichung
[CH2:1]=[C:2]1[O:6][C:4](=[O:5])[CH2:3]1.[CH3:7][O:8][C:9]1[CH:18]=[CH:17][C:16]2[C:11](=[CH:12][CH:13]=[C:14]([O:19][CH3:20])[CH:15]=2)[CH:10]=1>F>[C:4]([C:10]1[C:11]2[C:16](=[CH:15][C:14]([O:19][CH3:20])=[CH:13][CH:12]=2)[CH:17]=[CH:18][C:9]=1[O:8][CH3:7])(=[O:5])[CH2:3][C:2]([CH3:1])=[O:6]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
33.6 g (0.4 mol) of diketene were added drop by drop, while stirring at -30°C, to 37.6 g (0.2 mol) of 2,6-dimethoxynaphthalene in 200 ml of anhydrous hydrofluoric acid and the mixture was stirred for another 8 hours at said temperature. The hydrogen fluoride was distilled off under reduced pressure at a temperature of the still of -30°C and the residue washed until it was free from acid. After sublimation of unreacted starting product (11 g = 71 % conversion) colorless crystals of 1-acetoacetyl-2,6-dimethoxynaphthalene melting at 88°C were obtained by column chromatography (silica gel, 0.065 - 0.2 mm, CH2Cl2) in an amount of 35 g (90 % calculated on 2,6-dimethoxynaphthalene).