In the current edition of Beilstein's (1927) work the position of the halogen atoms in Boyen's (1888) dibromoveratric acid which he found to melt at 182°, are recorded as 2 and 5. Boyen merely determined the composition of his acid and did not even suggest a structure for it. The positions assigned for bromine seem to rest entirely on the statement of Zincke and Halm (1903) who assumed these positions in related compounds studied by them, though they offered no definite proof. They refer for support to the work of Auwers and Müller (1902) in the same field, but the last-named workers expressly state that the position of the second nuclear bromine atom in dibromoeugenol dibromide, from which Boyen obtained his acid, is unknown.
Proceedings of the Iowa Academy of Science
©1942 Iowa Academy of Science, Inc.
Floyd, Don E. and Raiford, L. Chas.
"Structure of the High-Melting Dibromoveratric Acid,"
Proceedings of the Iowa Academy of Science, 49(1), 283-283.
Available at: https://scholarworks.uni.edu/pias/vol49/iss1/39