Water → Monomethyl terephthalate

참여 물질

반응 단계

Concentrated sulfuric acid (277.5 ml, 5.2 mol) was added dropwise over 1/2 hr to a stirred solution of chromium (VI) oxide (299.25 g, 2.99 mol) and water (925 ml) at 0°. The resulting solution was added dropwise over 1 hr to a stirred solution of methyl-4-(hydroxymethyl)benzoate (92.5 g, 0.564 mol) and acetone (4.6 1) at 0°. The reaction mixture was allowed to warm to room temperature and stirred overnight. The supernatant was decanted before the black tar-like residue was extracted with acetone. The decanted supernatant and acetone extracts were combined and concentrated under vacuum to leave a dark brown residue which was triturated with cold water (4 liter). The precipitate which formed was collected, washed three times with water (1 liter), and dried to give 94.6 g (94%) of the title compound as white crystals, m.p. 218°-221° C.

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