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Preparation H6, Step 1: To a solution of dimethyl 5-tert-butylisophthalate (2.5 g, 10 mmol) in 20 mL of THF cooled to 0° C. was added dropwise a solution of lithium hydroxide monohydrate (168 mg, 7 mmol) in 5.0 mL of water. The reaction mixture was stirred at RT for 3 h. THF was removed under reduced pressure to give a yellow oil which was diluted with 10 mL of 1 N HCl. The aqueous phase was extracted with EtOAc (2×25 mL), and the extracts were combined, dried over Na2SO4, and concentrated to afford 700 mg of 3-tert-butyl-5-(methoxycarbonyl)benzoic acid. MS found: (M+H)+=237.

1. customPreparation H6, Step 1
2. customTHF was removed under reduced pressure
3. customto give a yellow oil which
4. extractionThe aqueous phase was extracted with EtOAc (2×25 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated