Ethylene Glycol → HCID 86709167, compound

Participants

Reaction Steps

To a solution of commercially available 4-fluoro-2-(trifluoromethyl)benzaldehyde (15 g, 78 mmol) in toluene (90 mL) was added ethylene glycol (21.77 mL, 390 mmol) and TsOH (0.743 g, 3.90 mmol). The mixture was then heated (under a Dean-Stark trap attached to a reflux condenser) in an oil bath at 140° C. for 4 h, about 1.4-1.5 mL of water was collected, which was close to the expected volume. TLC (20% EtOAc-hexane) showed a major, new more polar spot. The mixture is diluted with EtOAc (100 mL) and washed with water (50 mL). The organic phase is washed with water (1×50 mL) and brine (50 mL), dried over Na2SO4, filtered and concentrated. The residue was purified by silica gel column chromatography (330 g ISCO column) eluting with 0-10% EtOAc-hexane gradient. The cleanest fractions with product afforded 9.83 g (51% yield): MS (ESI): m/z 237 (M+H).

Provenance & Evidence