How is 1-Bromo-2-ethynylbenzene (CAS: 766-46-1) typically synthesized?

1-Bromo-2-ethynylbenzene can be synthesized through the reaction of bromine and ethynylbenzene under mild conditions. The synthesis involves the electrophilic aromatic substitution of bromine into the ethynyl group. Common methods include the use of iron as a catalyst to promote the reaction at room temperature with high yield and good selectivity.