Ethylene Glycol → 2-(3-Bromo-o-tolyl)-2-methyl-1,3-dioxolane

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Reaction Steps

A mixture of 100 parts of 3'-bromo-2'-methylacetophenone, 30 parts of ethylene glycol, 320 parts of anhydrous toluene and 2 parts of p-toluenesulfonic acid is stirred and refluxed for 4 hours with water-separator. A second fraction of 30 parts of ethylene glycol is added and stirring at reflux is continued for 18 hours. The reaction mixture is cooled and stirred for 30 minutes with 5 parts of sodium carbonate. The organic layer is separated, washed twice with water, dried and evaporated. The residue is distilled twice, yielding 2-(3-bromo-o-tolyl)-2-methyl-1,3-dioxolane; bp. 148°-150° C at 12 mm. pressure.

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