Three Rearrangements of a Bisdibromocarbene Adduct to Bullvalene, of (2α,4α,8β,10β)-3,3,9,9-Tetrabromopentacyclo2,4.05,7.08,10>dodec-11-ene
Skeletal rearrangements of the title compound 2 (thermic, with AgClO4 in methanol, and with BF3) yield 7, 8, and 9, respectively.The structure of 7 is confirmed by X-ray analysis.