Methyl iodide → 5-Methyl-5,6-dihydroindeno[2,1-b]indole

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Reaction Steps

In a 0.5 l bulb were placed 100 ml 50% aqueous NaOH, 100 ml benzene, 6.1 g (28 mmol)of 5,6-dihydroindeno[2,1-b]indole, prepared in Example 4, 1.8 ml (28 mmol) of MeI and 0.5 g of trimethylcetylammonium bromide. After having stirred the obtained mixture for 2 hours, the formation of an organic phase was observed; said phase was separated, washed twice with water (100 ml) and dried over Na2SO4. After removal of the solvent, the residue was recrystallized from ethanol, obtaining 4.8 g of N-methyl-5,6-dihydroindeno[2,1-b]indole (yield=78%).

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