D.A. Evans. K Scheidt Carbonium lon X-ray Structures: Bridged Carbocations Chem 206 FsSb-F-SFs「 F5Sb-F--SbF5 T Laube, Angew. Chem. Int. Ed. 1987, 26, 560 1467A1495A 2.092A 1739AM 1467A 1442A One of the longest documented C-c bond lengths 1503A T Laube, JACS 1989.. 9224 hyperconjugation unsymmetC C C C C C Å Å Me Me Me H Me Me Me Ph Cl AgSbF6 Me H Me Me Me F [F5Sb–F–SbF5] – 2 SbF5 C Me Me Ph F5Sb F SbF5 D. A. Evans, K. Scheidt Carbonium Ion X-ray Structures: Bridged Carbocations Chem 206 – 1.467 Å + 1.855 Å 1.503 Å 1.495 Å T. Laube, JACS 1989, 111, 9224 + 1.467 Å 1.442 Å 1.739 Å** 2.092 Å + + T. Laube, Angew. Chem. Int. Ed. 1987, 26, 560 **One of the longest documented C–C bond lengths. hyperconjugation no bridging unsymmetrical bridging