Ethylene Glycol → 2-(4-Bromophenyl)-1,3-dioxolane

Participants

Reaction Steps

4-Bromobenzaldehyde (3 g, 0.0162 moles) in benzene (60 mL) was treated with p-toluenesulfonic acid monohydrate (0.15 g, 0.79 mmoles) and ethylene glycol (5 mL, 0.0896 moles). The reaction was refluxed under nitrogen with azeotropic removal of water. After 3 hours, the reaction was cooled to room temperature and diluted with an equal volume of ethyl acetate. This solution was washed twice with aqueous bicarbonate, dried over magnesium sulfate and concentrated under reduced pressure. A colorless oil was recovered. Yield=2.83 g (92%). TLC (5% ethyl acetate in hexanes) showed clean product, Rf=0.17.

Provenance & Evidence