(2) (4) (25 °C) C, D Diels-Alder C D 1,3,5(1) (2) (3) (4) (5) (6) HOMO C D C D 1,3- LUMO (1) (4) Diels-Alder I Diels-Alder Diels-Alder (1) 150 °C Diels-Alder 170 °C, 41 °C 150 °C E (2) Diels-Alder (3) 1,3- A, B A, B (5) Diels-Alder F G Diels-Alder (6) H I H I Diels-Alder H I (1) A B 1,3,5- B A, B Diels-Alder (2) C C
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