Nitric Acid → Toluene-4-sulfonic acid 2-isopropyl-4-methoxy-5-nitro-phenyl ester

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Reaction Steps

To a solution of toluene-4-sulfonic acid 2-isopropyl-4-methoxy-phenyl ester (19.00 g, 59 mmol) in 118 mL AcOH was added 236 ml fuming HNO3 over 20 min. After 16 h the solution was pouring into a rapidly stirring slurry of 2 l of ice/H2O. After 15 min the precipitate was filtered, washed with H2O and dried under vacuum (50° C.) to give toluene-4-sulfonic acid 2-isopropyl-4-methoxy-5-nitro-phenyl ester (21.27 g, 98%) and toluene-4-sulfonic acid 2-isopropyl-4-methoxy-3-nitro-phenyl ester and as a pale yellow solid (7:1 inseperable mixture).

Provenance & Evidence