Ethanol → 5-(1,3-Dioxo-1,3-dihydro-isoindol-2-ylmethyl)-2,3,3-trimethyl-3H-indolium perchlorate

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Reaction Conditions

Reaction Steps

2-(2,3,3-Trimethyl-3H-indol-5-ylmethyl)-isoindole-1,3-dione (126 g, 0.396 mol; Sigma-Aldrich) was placed in 1 L one-necked flask equipped with magnetic stir bar and a reflux condenser. 500 mL Ethanol (500 mL, 8 mol; Pharmco) were added to the flask followed by addition of perchloric acid (35 mL, 0.40 mol; Aldrich). The reaction mixture was stirred with heating under reflux until all solids dissolved. The solution was then cooled at −10° C. for 3 hours and the separated crystals were filtered, washed with cold ethanol (100 mL), diethyl ether (2*100 mL) and dried. The yield was 166 g (100% of theoretical).

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