1,4-Dibromobenzene → 1-Allyldimethylsilyl-4-bromobenzene

Temperature

-78 °C

To a solution 1,4-dibromobenzene (28.3 g, 120 mmol) in dried THF (300 mL) at −78° C. was added n-butyllithium (40.0 mL, 2.5 M solution in hexanes, 100 mmol) over a period of 20 min. After 30 min of further stirring at −78° C., allylchlorodimethylsilane (13.5 g, 100 mmol) in THF (50 mL) was added dropwise over a period of 20 min, and the reaction mixture was warmed to room temperature. After stirring for 1 h at room temperature the reaction mixture was concentrated, and the residue was extracted with ether and brine. The organic layer was dried (Na2SO4) and distilled under reduced pressure to provide colorless liquid (21.9 g, 82%, b.p. 72° C./0.1 mmHg); 1H NMR (300 MHz, CDCl3) δ 0.31 (s, 6 H), 1.77 (d, J=8.07 Hz, 2 H), 4.87 (m, 1 H), 4.92 (m, 1 H), 5.78 (ddt, J=17.55, 9.51, and 8.07 Hz, 1 H), 7.41 (d, J=8.28 Hz, 2 H), 7.52 (d, J=8.28 Hz, 2H); 13C NMR (75 MHz, CDCl3) −3.5 (2 C), 23.6, 113.8, 123.9, 130.9 (2 C), 134.2, 135.3 (2 C), 137.5; HRMS calcd for C11H15BrSi 254.0127 and 254.0107, found 254.0128 and 256.0109.

1. temperaturethe reaction mixture was warmed to room temperature
2. stirringAfter stirring for 1 h at room temperature the reaction mixture
3. concentrationwas concentrated
4. extractionthe residue was extracted with ether and brine
5. dry with materialThe organic layer was dried (Na2SO4)
6. distillationdistilled under reduced pressure
7. customto provide colorless liquid (21.9 g, 82%, b.p. 72° C./0.1 mmHg)

ORD record

ord-2f189d52ce314a828f250f8968a38558

Source dataset

uspto-grants-2002_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06416861B1