Thermal reorganisations of some cyclopropylidene-cycloalkanes. The unique character of the biscycloproplidene–methylenespiropentane system

A kinetic and thermodynamic investigation of the thermal reorganization of cyclopropylidene-cycloalkanes to methlylenespiro[2,n]alkanes is presented: the exceptional behaviour of the biscyclopropylidene–methylenespiropentane system is discussed.