Water → Dimethyl 2,5-di(thiophen-2-yl)terephthalate

HRID 1473805Notes

Reaction equation

Br[C:2]1[CH:11]=[C:10]([C:12]([O:14][CH3:15])=[O:13])[C:9](Br)=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].[Br-].[S:18]1[CH:22]=[CH:21][CH:20]=[C:19]1[Zn+].O>C1COCC1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:7][O:6][C:4](=[O:5])[C:3]1[CH:8]=[C:9]([C:19]2[S:18][CH:22]=[CH:21][CH:20]=2)[C:10]([C:12]([O:14][CH3:15])=[O:13])=[CH:11][C:2]=1[C:19]1[S:18][CH:22]=[CH:21][CH:20]=1

Participants

Conditions

Temperature: 67 °C

Procedure

Dimethyl 2,5-dibromoterephthalate (6.09 g, 17.30 mmol) is dissolved in anhydrous THF (100 cm3), followed by the addition of 2-thienylzinc bromide (0.50 M in THF, 90 cm3, 45.0 mmol) and Pd(PPh3)4 (0.50 g, 0.43 mmol). The mixture is heated at 67° C. for 2 hours. After cooling, the reaction mixture is poured into water. The precipitate is collected by filtration and washed with water, methanol and diethyl ether then dried in vacuo, to yield the product as a pale yellow solid (5.41 g, 87%). 1H NMR (300 MHz, CDCl3): δ(ppm) 7.82 (s, 2H, Ar—H), 7.40 (dd, J=4.8 and 1.4 Hz, 2H, Ar—H), 7.07-7.12 (m, 4H, Ar—H), 3.78 (s, 6H, CH3); 13C NMR (75 MHz, CDCl3): δ(ppm) 168.1 (C═O), 140.3 (q), 133.6 (q), 133.4 (q), 131.9 (CH), 127.5 (CH), 127.0 (CH), 126.7 (CH), 52.6 (CH3); MS (m/e): 358 (M+, 100%), 327, 299, 240, 195.

Workup

temperatureAfter cooling
filtrationThe precipitate is collected by filtration
washwashed with water, methanol and diethyl ether
customthen dried in vacuo

Sources & evidence

ORD record: ord-2dc0fb65827c49c58d7ffba3bbbd7409
Source dataset: uspto-grants-2015_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09017577B2

Reaction notes

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