1. Intramolecular cycloadditions of o-quinodimethanes
2. and J. Amer. Chem. Soc. 3836;
3. Photoisomerization of 2-[2-(N-Ethoxycarbonyl-N-allylamino)ethyl]benzaldehyde
4. Carbonyl compounds, azomethines and nitriles in general act as weak dienophiles, except for some derivatives that are activated by electron-withdrawing substituents: : 1, 4-Cycloaddition Reactions, Academic Press, New York 1967, p. 97, 128, 205;