Zincke studied the action of nitrous acid on the bromine derivatives of the cresols, and found that in the meta series the halogen atom para to hydroxyl is replaced by the nitro radical, while in the ortho and para series the atom ortho to hydroxyl is replaced. In no case did he report the formation of isomeric compounds as a result of a single nitration.
Proceedings of the Iowa Academy of Science
©1930 Iowa Academy of Science, Inc.
Raiford, L. Chas. and Miller, G. R.
"Selective Action in the Zincke Nitration,"
Proceedings of the Iowa Academy of Science, 37(1), 250-250.
Available at: https://scholarworks.uni.edu/pias/vol37/iss1/52