First of all i am sorry for my bad english!
I have made a synthesize of 1,2-dibromo-4,5-dimethoxybenzene.
This was done by adding Br2 to 1,2-Dimethoxybenzene.
My question is, if it is necessary to add the bromine to the 1,2-Dimethoxybenzene to get 1,2-dibromo-4,5-dimethoxybenzene or can the order of addition be reversed? And if so which catalyst for this reaction is needed?