You have to brominate Phenol in carbon disulfide to obtain 4-Bromophenol. At -30° C, 4-bromophenol is yielded by 97% and at +30° C, the yield is 82%. You will need a 5 litre flask fitted with a mechanical stirrer, a reflux condensor and a separatory funnel. To the top of the tunnel, a calcium chloride tube is attached and from this, a glass tube leading into a beaker holding about 1200ml of cracked ice and water for the absorption of hydrobromic acide evolves. In a separatory funnel approximately 546 ml of bromine which is dissolved in equal volume of carbon disulfide is placed. The flask is cooled in salt and ice mixture while the stirring starts and bormine solution starts to run in. This takes approximately 2 hours. Post 2 hours, the flask is detached and a condensor is attached in downward distillation. The flask is then heated and the carbon disulfide is distilled of. The carbon disulfide collects as much as 1200ml. The residual liquid is then vaccum distilled yiekding 1660gs of p-bromophenol boiling 145-150/25-30mm and 136 gms of lower boiling material consisting of a mixture of o- and p-bromophenol. The reaction mixture should be cooled with salt and ice, when making 4-bromophenol. 25gms of 1,4 dioxane dibromide is gradually added to 9.4 gms of phenol with water cooling. Then the mixture is poured with water and extracted with ether. The ether is dried with sodium sulfate, filtered and evaporated yielding 88% of 4-bromophenol.