Triethyl phosphite → 11,11-Dimethyl-5,11-dihydroindeno[1,2-b]carbazole

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Reaction Steps

A mixture of 75 g (238 mmol) of 2-(2-nitrophenyl)-9,9-dimethyl-9H-fluorene and 290.3 ml (1669 mmol) of triethyl phosphite is heated under reflux for 12 h. The triethyl phosphite which remains is subsequently removed by distillation (72-76° C./9 mm Hg). Water/MeOH (1:1) is added to the residue, and the solid is filtered off and recrystallised. Yield: 61.3 g (216 mmol), 92%.

Provenance & Evidence