Chloromethyl Methyl Ether → 1,3-Dibromo-5-(methoxymethoxy)benzene

To a suspension of sodium hydride (693 mg, 17.33 mmol, 60%, oil was washed with pentane) in THF (15 mL) was added 3, 5-dibromophenol (3.0 g, 11.55 mmol) at 0° C. and the suspension was stirred for 30 minutes. Then, methoxymethyl chloride (1.4 g, 17.33 mmol) was added at 0° C. The resulting suspension was allowed to warm to room temperature and stirred for 2 days at which time TLC analysis of the mixture indicated the absence of starting material. Then, the reaction mixture was poured into an ice-water (50 mL) and the organic compound was extracted into ethyl acetate (2×100 mL). The combined extracts were washed with brine solution (250 mL) and dried over anhydrous magnesium sulfate. Filtration of the drying agent and the concentration of the solution under reduced pressure gave the crude residue which was purified by using an ISCO 120 g column chromatography, eluting with 5-20% ethyl acetate in hexanes to obtain 1,3-dibromo-5-methoxymethoxy-benzene (2.94 g, 86%) as a white solid: EI(+)-HRMS m/e calcd for C8H8Br2O2 (M)+ 293.8891, found 293.8893.

1. stirringstirred for 2 days at which time TLC analysis of the mixture
2. extractionthe organic compound was extracted into ethyl acetate (2×100 mL)
3. washThe combined extracts were washed with brine solution (250 mL)
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationFiltration of the drying agent
6. customthe concentration of the solution under reduced pressure gave the crude residue which
7. customwas purified
8. washeluting with 5-20% ethyl acetate in hexanes

ORD record

ord-d1893f18966a4a109f26f4598580a13b

Source dataset

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08093253B2