2,5-Dibromoterephthalic acid diethyl ester

The inventive diindenothiophene derivatives can be produced by any of the methods that are conventionally known to persons having ordinary skill in the art. For instance, the above-mentioned compound of formula (2) can be prepared by a method comprising the following steps:Under nitrogen protection, Diethyl 2, 5-dibromoterephthalate (2g, 5.26mmol), compound 1 (7.03, 13.68mmol), and dry toluene (40mL) were added to a 100mL two-necked flask, and nitrogen was bubbled through to remove it. After half an hour of oxygen, Pd (PPh3) 4 (116 mg, 0.1 mmol) was quickly added, and the reaction solution was heated to 110 C and refluxed for 24 hours. After the reaction was stopped, the reaction solution was cooled to room temperature, and the toluene solvent was distilled off with a rotary evaporator. It was then separated and purified with a chromatography column using petroleum ether / dichloromethane as the eluent (volume ratio of 3: 2) to obtain Compound 2 (2.85 g, 81.2%) as a brown solid.Under nitrogen, diethyl 2, 5-dibromoterephthalate (compound 1) (3.93 g, 10.34 mmol), compound 2 (4.00 g, 6.89 mmol), and dry toluene (100 mL) were added in this order. In a 250 mL double-necked flask, nitrogen was bubbled to remove oxygen for half an hour, and Pd (PPh3) 4 (159.25 mg, 137.81 mumol) was quickly added. The reaction solution was heated to 100 C. and reacted for 48 hours. After the reaction was stopped, the reaction solution was cooled to room temperature, and the toluene solvent was distilled off with a rotary evaporator. Subsequently, it was separated and purified by a chromatography column using petroleum ether / ethyl acetate as an eluent (volume ratio of 15: 1) to obtain an orange viscous liquid 3 (2.20 g, 54%).

Molecular Weight:380.03
XLogP3:3.7
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:6
Exact Mass:379.90818
Monoisotopic Mass:377.91023
Topological Polar Surface Area:52.6
Heavy Atom Count:18
Complexity:279
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes