Sodium Carbonate → HCID 58978754, compound

Participants

Reaction Conditions

Reaction Steps

Into a flask was introduced 100 mL of toluene, 8.77 g of 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-dioctylfluorene (10) (17 mmol), 2 g of 4,7-dibromo-benzo[1,2,5]thiadiazole (5) (6.8 mmole), 0.69 g of Aliquat® 336 (1.7 mmol) and 17.2 mL of aqueous 2M Na2CO3. This was N2 purged for 1 h. The flask was heated to about 80° C. and 33 mg of tetrakistriphenylphosphine palladium (0) (0.0042 mmol) then added under a nitrogen purge. The content of the flask was refluxed for 3 days. The reaction flask was allowed to cool to RT and about 50 mL water added and the organic layer separated. The aqueous layer was extracted with 50 mL toluene. The organic layers were combined and washed successively with water twice and then dried over MgSO4. Concentration gave an oil which was purified by flash chromatography (eluent: 10% CH2Cl2 in Hexane) to give 4.0 g (64% yield) of 4,7-Bis-(9,9-dioctyl-9H-fluoren-2-yl)-benzo[1,2,5]thiadiazole 16 as a green solid. Compound 16 was shown to exhibit a blue-white fluorescence (425 nm and 518 nm emissions) in dilute toluene solution when excited at 375 nm. At 0.2 mg/mL or as a spin cast thin film, this compound gave a green fluorescence (518 nm) under UV excitation.

Provenance & Evidence