A novel cycloreaction involving intramolecular addition of cyclopropane to a tetrasubstituted cyclobutane contained in a dispiro-system to form a seven-membered ring is described.
S. Sarel, A. Felzenstein and J. Yovell, J. Chem. Soc., Chem. Commun., 1974, 753 DOI: 10.1039/C39740000753
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