Heterocumulenes are molecules that contain a heteroatom (other than carbon) and multiple double bonds. They can act as dienophiles in the Diels-Alder reaction, similar to traditional dienophiles like maleic anhydride.
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2-ethyl-1,2-dihydro-5-methyl-2,3,6-triphenylpyrimidin-4(3H)-one
1-bromo-1-(4-nitrophenyl)-2-(p-toluenesulfonamido)ethane
