Some compounds containing a methylene group adjacent to certain activating radicals will interact with the carbonyl radicals of aldehydes and ketones. These condensations seem to depend chiefly on (a) the nature of substituents in the starting materials, and (b) the character of the condensing agents.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Raiford, L. Chas. and Fox, Donald E.
"Condensation of Vanillin Substitution Products with Methylene Derivatives,"
Proceedings of the Iowa Academy of Science, 40(1), 111-111.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/51