[H-].[Na+].[CH:3]1[CH:18]=[CH:17][CH:16]=[C:15]2[C:4]=1[CH2:5][C:6]1[C:14]3[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=3[NH:8][C:7]=12.S(OC)(O[CH3:23])(=O)=O.O>CS(C)=O>[CH3:23][N:8]1[C:9]2[CH:10]=[CH:11][CH:12]=[CH:13][C:14]=2[C:6]2[CH2:5][C:4]3[C:15]([C:7]1=2)=[CH:16][CH:17]=[CH:18][CH:3]=3Sodium hydride (375 mq, 15.6 mmol) was added to dimethylsulfoxide (DMSO) (13 cm3) under an atmosphere of nitrogen. The solution was then heated to 70° C. until no more gas (H2) evolved. The solution was cooled to room temperature and 5,10-dihydroindeno[1,2-b]indole (2.69 g, 13.1 mmol) dissolved in a minimum amount of DMSO was added. After stirring at room temperature for 1 hour, dimethyl sulphate (1.5 cm3, 15 mmol) was introduced, and stirring continued for a further 1 hour. Water (3 cm3) was cautiously added, and the reaction then poured into ice/water. The solid thus formed was collected by suction filtration, washed firstly with water, dried on the water pump, and then washed with petrol (60°-80° C.). Crystallization from ethanol yielded colourless needles of the title compound. Yield: 1.52 g (53%). M.p. 152° C. 1H NMR (CDCl3) δ: 3.55 (2H, s,), 3.85 (3H, s,), 6.8-7.4 (8H, m, arom.).
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