Trimethyl orthoformate → 1-Bromo-4-(dimethoxymethyl)benzene

21.1 g (114 mmol) of 4-bromobenzaldehyde and 20 ml (182 mmol) of trimethyl orthoformate (both Fluka, Buchs, Switzerland) are dissolved in 35 ml of methanol, and 0.65 g (3.4 mmol) of p-toluenesulfonic acid monohydrate is added at room temperature (exothermic reaction). The reaction mixture is stirred at room temperature under nitrogen for 20 hours. The acid is then neutralised with 0.62 ml of 30% sodium methanolate solution in methanol (3.4 mmol); the reaction mixture is concentrated using a rotary evaporator and the residue is distilled. The title compound is obtained in the form of a colourless liquid. TLC: Rf=0.58 (hexane/ethyl acetate 2:1). B.p.: 90-92° C. (4 mbar). 1H-NMR (CDCl3; 200 MHz): 7.50 and 7.32/each d, J=9 (2×2H); 5.36/s (1H); 3.31/s (6H).

1. custom(exothermic reaction)
2. concentrationthe reaction mixture is concentrated
3. customa rotary evaporator
4. distillationthe residue is distilled

ORDレコード

ord-e2989b6615fc46b98d02ee850918d80b

出典データセット

uspto-grants-2001_10

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US06300519B1