Sodium Hydroxide → 1-Methyl 5-(phenylmethoxy)-1,3-benzenedicarboxylate

Participants

Reaction Steps

To a solution of 5-benzyloxy-isophthalic acid dimethyl ester (D44) (24 g, 80 mmol, 1 equiv) in MeOH (300 ml) was added 1N aqueous NaOH solution (76 ml, 76 mmol, 0.95 equiv) and the resulting solution was stirred at room temperature for 17 h. A second portion of 1N aqueous NaOH solution (15 ml, 15 mmol, 0.2 equiv) was added and the solution stirred for another 6 h. Most of the MeOH was removed in vacuo and the residue was partitioned between AcOEt and 1N aqueous NaOH solution. The aqueous layer was extracted with AcOEt, acidified to pH 1 and re-extracted with AcOEt. The second organic extract was dried over MgSO4 and concentrated in vacuo. The residue was triturated with Et2O to give 5-benzyloxy-isophthalic acid monomethyl ester (D46) (15.5 g, 68%) as a white solid. [M+H]+=2.86.0, RT=3.32 min

Provenance & Evidence