Synthesis of Heilonine (1)ª Please explain the mechanism of the transition metal catalyzed [2+2 + 2] cycloisomerization reaction shown in the image. I need a curved arrow mechanism shown as well as a verbal description of the mechanism. Synthesis of Heilonine (1) a Me 25 N H Me ཀ+ b. RhCI(PPh3)3 (cat.) Me Me EtOH, 80 °C H yield 89% yield Me- Me 27 Me- 28 Me c. L י

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