G. Kramer et al., GENERATION AND TRANSFORMATION OF THE [3.3.1]PROPELLANE SKELETON BY THERMAL REARRANGEMENTS, Tetrahedron letters, 35(45), 1994, pp. 8353-8356
In a sequence of unexpected thermal rearrangements the strained monocy
clic alkyne 4 is transformed into the tricyclic system 5 which yields
in a flash vacuum pyrolysis again a monocyclic compound 10.