2,6-Dimethoxybenzaldehyde → 2,6-Dihydroxybenzaldehyde

Into a 3000-mL three neck round-bottom flask, was placed a solution of AlCl3 (240 g, 1.80 mol, 3.00 equiv) in dichloromethane (1200 mL). A solution of 2,6-dimethoxybenzaldehyde (100 g, 601.78 mmol, 1.00 eq) in dichloromethane (800 ml) was added to the reaction mixture dropwise at 0° C. The resulting solution was stirred overnight at room temperature, and then it was quenched with 200 mL of diluted HCl (2M). The resulting solution was extracted with 2×200 mL of dichloromethane. The combined organic layers were concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (1:200-1:50) as eluent to furnish 40 g (48%) of 2,6-dihydroxybenzaldehyde as a yellow solid. 1HNMR (300 MHz, DMSO-d6) δ 11.25 (s, 2H), 10.25 (s, 1H), 7.36 (m, 1H), 6.36 (d, J=8.4 Hz 2H); MS (ESI) m/z 139 [M+H]+.

1. customit was quenched with 200 mL of diluted HCl (2M)
2. extractionThe resulting solution was extracted with 2×200 mL of dichloromethane
3. concentrationThe combined organic layers were concentrated under vacuum

ORD record

ord-44c0b12bf3564300a7dd76e53c558149

Source dataset

uspto-grants-2015_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08952171B2