Methane, dichloromethoxy- → 5-iodo-2-methoxybenzaldehyde

Temperature

0 °C

To a solution of 2.04 grams (8.72 mmol) of 4-iodoanisole in 36 mL of CH2Cl2, cooled to 0° C., was added dropwise 2.0 mL (18.7 mmol) of titanium tetrachloride. After stirring for 30 min., 0.93 mL (10.3 mmol) of α,α-dichloromethyl methyl ether was added and the reaction maintained at 0° C. for another 2 hours. The reaction mixture was then poured with stirring into a mixture of 50 mL of CH2 Cl2 and 50 mL of saturated aqueous sodium bicarbonate (NaHCO3). After 30 min., this was filtered through diatomaceous earth, the organic layer was separated, the aqueous layer was twice extracted with CH2 Cl2, and all of the organic layers were combined, dried with MgSO4 and concentrated in vacuo. The crude residue was recrystallized from ethanol (EtOH) to give 5-iodo-2-methoxybenzaldehyde as pale yellow needles, 1.37 grams (60%).

1. additionThe reaction mixture was then poured
2. waitAfter 30 min.
3. filtrationthis was filtered through diatomaceous earth
4. customthe organic layer was separated
5. extractionthe aqueous layer was twice extracted with CH2 Cl2
6. dry with materialdried with MgSO4
7. concentrationconcentrated in vacuo
8. customThe crude residue was recrystallized from ethanol (EtOH)

ORD record

ord-fcb1255ff61c493a83f2869a138d11ef

Source dataset

uspto-grants-1998_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05854262