Reaction of 1,4-diiodonorbornane, 1,4-diiodobicyclo[2.2.2]octane, and 1,5-diiodobicyclo[3.2.1]octane with butyllithium. Convenient preparative routes to the [2.2.2]- and [3.2.1]propellanes
Mechanistic definition of trimethylstannylation of 1,4-dihalobicyclo[2.2.1]heptanes: bridgehead nucleophilic substitution mediated by the intermediacy of radicals, radical anions, carbanions, and [2.2.1.]propellane