p-Toluenesulfonic acid → 1-Chloro-2-(methoxymethoxy)benzene

Beteiligte Stoffe

Reaktionsschritte

2-Chlorophenol (96.4 g, 0.75 mol), dimethoxymethane (257.9 g, 3.39 mol) and 750 mg of p-toluenesulfonic acid were dissolved in 1.5 L of methylene chloride and the mixture heated at reflux with stirring under nitrogen for 72 hours in a flask equipped with a Soxhlet extraction apparatus containing 400 g of 3A molecular sieves. The mixture was allowed to cool and 3 ml of triethylamine was added. The mixture was then extracted with 2N sodium hydroxide and the organic phase was dried over magnesium sulfate. Evaporation of the volatiles under reduced pressure left 66.9 g of crude 1-chloro-2-methoxymethoxybenzene as a residue. This was distilled and the fraction boiling at 94° C. and 6.5 mm pressure was collected to obtain 51.3 g (40 percent of theory) of purified product. The proton nmr spectrum was consistent with the assigned structure.

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