CC(C)([O-])C.[Na+].[Br:7][C:8]1[CH:20]=[CH:19][C:18]2[C:17]3[C:12](=[CH:13][C:14]([Br:21])=[CH:15][CH:16]=3)[CH2:11][C:10]=2[CH:9]=1.[C:22](=S)([S:25][CH3:26])[S:23][CH3:24].CI>CS(C)=O>[Br:7][C:8]1[CH:20]=[CH:19][C:18]2[C:17]3[C:12](=[CH:13][C:14]([Br:21])=[CH:15][CH:16]=3)[C:11](=[C:22]([S:25][CH3:26])[S:23][CH3:24])[C:10]=2[CH:9]=1Sodium tert-butoxide (1.24 g, 12.9 mmol) was added portionwise over 2 min to a solution of 2,7-dibromofluorene (2.0 g, 6.2 mmol) in DMSO (40 ml) at RT under nitrogen. To the resulting red solution was added dimethyl trithiocarbonate (0.94 g, 6.8 mmol) via a syringe. The reaction was stirred for 5 min and methyl iodide (1.8 g, 12.6 mmol) was added over 2 min. The reaction was stirred for 1 h worked up as above. Recrystallization from ethyl acetate/THF (2:1) afforded 2.4 g (91%). The sample was identical in all respects to that described above.
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