Intramolecular [3 + 4] cycloaddition in substituted dispiro[2,3,x]alkanes. A new pathway to polycyclic olefins containing cycloheptene

Abstract
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.

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