... Volume: Page: ... Heterocycles that had electron-rich substituents provided good yields. ... A few other alternative reagents for the bromination of heterocyclic compounds include NBS,(11) KBr/HNO 3 /H 2 SO 4 ,(12) Bu 4 NBr/P 2 O 5 ,(13) DBH/PPHF(1,3-dibromo-5,5 ...