In previous work1 it was found that when the hydrazones of unsymmetrical dibenzalacetones rearrange to the isomeric pyrazolines, the closing of the ring involved the unsaturation farthest away from the phenyl nucleus containing the halogen or nitro radical. Since these substituents are often spoken of as "negative" in character, it was decided to test the behavior of compounds containing substituents that might be regarded as "positive." To this end there has been prepared a series of unsymmetrical ketones in which one of the groups is the p-dimethylaminobenzal radical, and the other is a substituted vanillal residue. These ketones will be converted into the corresponding hydrazones and the direction of rearrangement determined.
Proceedings of the Iowa Academy of Science
©1935 Iowa Academy of Science, Inc.
Cooper, Margaret M. and Raiford, L. Chas.
"Condensation of P-Dimethylaminobenzaldehyde with Vanillalacetone Substitution Products,"
Proceedings of the Iowa Academy of Science, 42(1), 124-124.
Available at: https://scholarworks.uni.edu/pias/vol42/iss1/50