3-Bromobenzyl bromide → 1-Bromo-3-(but-3-en-1-yl)benzene

To a solution of 1-bromo-3-(bromomethyl)benzene (10.0 g, 40.0 mmol) in tetrahydrofuran (50 mL), under an inert atmosphere was added allylmagnesium bromide (1.0 M in diethyl ether, 40.0 mL, 40.0 mmol). The reaction was allowed to reflux overnight. The reaction was quenched with sulfuric acid (2 M, 45 mL). The resulting biphasic solution was solution was partitioned. The aqueous layer was extracted with diethyl ether (2×50 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated. The resulting residue was purified by flash column chromatography using 100% hexanes as eluent providing the title compound as a clear liquid (7.51 g, 71%, ˜80% pure): 1H NMR (400 MHz, DMSO-d6) δ 7.42 (ddd, J=2.1, 1.4, 0.7 Hz, 1H), 7.37 (dt, J=7.1, 2.1 Hz, 1H), 7.28-7.18 (m, 2H), 5.81 (ddt, J=16.9, 10.2, 6.5 Hz, 1H), 5.09-4.90 (m, 2H), 2.67 (dd, J=8.6, 6.8 Hz, 2H), 2.32 (tdt, J=7.7, 6.5, 1.5 Hz, 2H); 13C NMR (101 MHz, DMSO-d6) δ 144.35, 137.61, 131.05, 130.28, 128.62, 127.44, 121.53, 115.37, 34.59, 33.91; EIMS m/z 210 ([M]+).

1. temperatureto reflux overnight
2. customThe reaction was quenched with sulfuric acid (2 M, 45 mL)
3. customwas partitioned
4. extractionThe aqueous layer was extracted with diethyl ether (2×50 mL)
5. dry with materialThe combined organic layers were dried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customThe resulting residue was purified by flash column chromatography

ORD record

ord-52310b7ace7049dda8415f157970c80a

Source dataset

uspto-grants-2016_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09249133B2