Ethylene Glycol → HCID 66776924, compound

Participants

Reaction Steps

3,4-Dihydro-2H-pyran (30.0 g, 0.36 mol), ethylene glycol (310.0 cm3, 5.36 mol) and p-toluene sulphonic acid (ca. 1 mol %, catalyst) were added to dichloromethane (100 cm3) and the mixture stirred at ambient temperature for 18 hours under an inert gas atmosphere. Water (ca. 150 cm3) was then added, resulting in a biphasic mixture. The organic phase (containing the desired product) was collected and the aqueous phase (containing excess ethylene glycol) extracted with further portions of dichloromethane (3×50 cm3). The combined organic phase and washings were dried over anhydrous magnesium sulphate, filtered and solvent removed in vacuo to yield the crude product containing, almost exclusively, the mono-protected alcohol. The desired product was isolated via flash column chromatography (using silica gel 60 and a 3:1 ratio of hexane:ethyl acetate as eluant). Yield=9.10 g (17.3%).

Provenance & Evidence