Potassium Hydroxide → 3-Bromostyrene

Participants

Reaction Steps

To a solution of 1-bromo-3trimethylsilylethynylbenzene (20.5 g, 81.0 mmol) in degassed methanol (500 ml) was added potassium hydroxide (31 mg, 0.55 mmol) in water (1 ml). The solution was stirred at room temperature until G.C. analysis indicated the reaction was complete (5.0 h). The reaction mixture was diluted with an equal volume of water, and extracted with n-pentane (5×500 ml). The combined organic layers were dried (MgSO4) and the solvent removed under reduced pressure to yield a yellow liquid. The liquid was distilled via bulb-to-bulb vacuum distillation to yield the product (1c) (13.0 g, 90%) as a clear liquid: bp 40° C.C/1 torr; 1H NMR (200 MHz, CDCl3) c3.35(s), 7.23(t), 7.40(m), 7.65(t).

Provenance & Evidence