Regioselective bromination of activated aromatic substrates with a ZrBr 4/diazene mixture

~77%

~79%

~87%

~71%

~0%

~0%

~0%

~0%

~0%

~0%

~88%

~78%

~73%

~0%

~0%

~0%

~0%

~0%

~0%

~0%

~0%

~0%

~0%

~0%

~76%

~78%

~88%

~89%

~70%