This is very dangerous synthesis, the bromine is very toxic and irritating and benzene is carcinogen so be very careful!!
If you have the option to buy this compound do it, this reaction is low yielding and not very nice.
The reaction shouldn't be warmed much during the addition of bromine because higher production of p-dibromobenzene as a side product is observed.
Other halogen carrier such as pyridine can be used.
