The adducts from the reaction of 4-phenyl-1, 2, 4-triazoline-3, 5-dione with a number of α, β- unsaturated ketones have been isolated and characterized. The reaction generally proceeds with migration of the double bond to the β, γ-position and is highly chemoselective towards reaction with enones which have, or can assume, an s-cis conformation.
![1,2,4-Triazolidine-3,5-dione,1-[4-methyl-1-(1-methylethenyl)-2-oxo-3-cyclohexen-1-yl]-4-phenyl- Structure](https://image.chemsrc.com/caspic/043/82511-80-6.png)