反应详情

4,5-Dichlorobenzene-1,2-dicarbaldehyde (2.0 g, 9.90 mmol) and 1,4-cyclohexanedione (0.62 g, 5.53 mmol) were stirred in 60 mL ethanol. To this was added dropwise with stirring, 10 mL of 5% aq potassium hydroxide. Upon addition of first drop, solution became black, brown, and then solids precipitate. Reaction mixture was stirred at RT for 1 h and refluxed for 2 h. Reaction mixture was cooled to RT, solids filtered, washed with water, dried to give 2,3,9,10-tetrachloro-6,13-pentacenequinone as brown solids in good yields (1.73 g, 70%). LDI-MS m/z: 446 [M+].

1. additionTo this was added dropwise
2. additionUpon addition of first drop, solution
3. customReaction mixture
4. stirringwas stirred at RT for 1 h
5. temperaturerefluxed for 2 h
6. customReaction mixture
7. filtrationsolids filtered
8. washwashed with water
9. customdried