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- W2099508720 abstract "Thermal cycloaddition reaction of 4-benzoyl-5-ethoxycarbonyl-1H-pyrrole-2, 3-dione (dioxopyrroline) 1 with 1, 3-dienes caused two types of Diels-Alder (D-A) reaction in a competitive manner. One is the hetero D-A reaction in whch dioxopyrroline acts as an electron-deficient diene and the 1, 3-diene acts as an electron-rich dienophile. The other is the normal D-A reaction in which diosopyrroline acts as an electron-deficient dienophile. The 1, 3-dienes bearing electron-rich substituents undergo the D-A reaction via the normal pathway, while the 1, 3-dienes which do not bear an electron-donating group predominantly undergo the hetero D-A reaction. When the normal D-A pathway is sterically hindered, the hetero D-A pathway occurs exclusively." @default.
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- W2099508720 date "1996-01-01" @default.
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- W2099508720 title "Dioxopyrrolines. LXI. Cycloaddition Reaction of 4-Benzoyl-5-ethoxycarbonyl-1-phenyl-1H-pyrrole-2,3-dione with 1,3-Dienes: Competitive Occurrence of Normal and Hetero Diels-Alder Reaction and Claisen Rearrangement of the Hetero Diels-Alder Product." @default.
- W2099508720 doi "https://doi.org/10.1248/cpb.44.681" @default.
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