I should like to attempt to explain why a starting material that may apparently afford a propellane and/or a dispiran sometimes gives one or another, apparently not a mixture of both. There does not appear to be a denominator common for all the cases to be discussed but perhaps discussion of cases pertaining both to carbocyclic and heterocyclic compounds may cast some light on the problem; there need not be a unique reason for the behavior in the two series.

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