Ethylene Glycol → 4,4'-(1,3-Dioxolane-2,2-diyl)diphenol
Reaktionsgleichung
O[C:2]1[C:3](O)=[C:4]([CH:13]=[CH:14][CH:15]=1)[C:5]([C:7]1[CH:12]=[CH:11]C=[CH:9][CH:8]=1)=O.[CH2:17]([OH:20])[CH2:18][OH:19].[CH:21]([O-:25])([O-])OC.C(OCC)(=[O:28])C>>[OH:28][C:15]1[CH:2]=[CH:3][C:4]([C:5]2([C:7]3[CH:8]=[CH:9][C:21]([OH:25])=[CH:11][CH:12]=3)[O:20][CH2:17][CH2:18][O:19]2)=[CH:13][CH:14]=1Komponenten
5
Versuchsvorschrift
In a flask equipped with a stirring blade and a thermometer, montmorillonite clay K10 (150 g) and 99 g of dihydroxybenzophenone were charged and the atmosphere in the flask was replaced by nitrogen. 242 mL of ethylene glycol and 99 mL of methyl orthoformate were added and the reaction was carried out at 110° C. while distilling of by-products produced. After 18 hours, 66 g of methyl orthoformate was added and the reaction was carried out for additional 30 hours, namely, 48 hours in total. The reaction solution was diluted with 300 mL of ethyl acetate added, filtered and then extracted with an aqueous 2% sodium hydrogen carbonate solution four times. The extract solution was concentrated and then recrystallized from dichloroethane to obtain the objective 2,2-bis(4-hydroxyphenyl)-1,3-dioxolane. From gas chromatography, the purity was found to be 99.5%.