1,3-Dibromopropane → 1,2-Bis(4-(3-bromopropoxy)phenyl)ethane-1,2-dione

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

1,2-bis(4-hydroxyphenyl)ethane-1,2-dione (2.6 g, 10.74 mmol) was dissolved in DMF and K2CO3 (5.9 g, 42.7 mmol) was added, 100 mmol of 1,3-dibromopropane and a catalytic amount of KI were then added. The mixture was heated to 80° C. and stirred for 3 days. TLC check showed 1,2-bis(4-hydroxyphenyl)ethane-1,2-dione disappeared. Dimethylformamide (DMF) was removed, and water was added, extracted by EtOAc, washed with brine, dried over MgSO4. The solvent was removed and the residue was purified by column chromatography to give 1,2-bis(4-(3-bromopropoxy)phenyl)ethane-1,2-dione 6 as a pale yellow solid, as confirmed by the following nuclear magnetic resonance (NMR) data obtained therefrom: 1H NMR (500 MHz, CDCl3): δ 7.94 (d, J=8.8 MHz, 4H), 6.99 (d, J=8.8 MHz, 4H), 4.20 (t, J=6.2 MHz, 4H), 3.61 (t, J=6.2 MHz, 4H), 2.34 (m, 4H) ppm.

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