Photochemical rearrangement of the polycyclic homotropylidene carbonate (4) yieds the heptacyclic carbonates (5), (6), and (8), from which the tetracyclo[4,4,2,02,5,07,10]dodecatrienes (1)–-(3) are synthesized.
U. Erhardt and J. Daub, J. Chem. Soc., Chem. Commun., 1974, 83 DOI: 10.1039/C39740000083
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