Knoevenagel condensation involves the reaction of an aldehyde with a compound containing an active methylene group (usually a compound with at least two hydrogen atoms bound to a carbon adjacent to a carbonyl group). This reaction can yield α,β-unsaturated aldehydes, which can be considered enol ethers.
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<(Diethylamino)methylene>cyclohexane
C18H23N3O2
8-Methoxy-3-(1H-tetrazol-5-yl)coumarin
3-(4-chloro-phenyl)-2-cyano-propionic acid ethyl ester
5-((5-chloro-2-phenyl-1H-indol-3-yl)methylene)pyrimidine-2,4,6(1H,3H,5H)-trione
1,3-Cyclohexanedione, 2-[(4-methoxyphenyl)methylene]-5,5-dimethyl-
5-imino-2-phenyl-5H,11bH-furo[3',2':5,6]-pyrano[3,4-c]chromen-6-amine
2-Methyl-5-ethoxy-3-benzoyl-4,5-dihydrofuran
3-Pyridinecarboxylic acid, 5-cyano-2-(dibromomethyl)-1,4,5,6-tetrahydro-6-oxo-4-phenyl-, ethyl ester
4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester
2-((3-bromophenyl)(2,3-dihydro-1,3-dioxo-1H-inden-2-yl)methyl)-2H-indene-1,3-dione
