“α,α,α”‐, “α,β,α”‐ and “α,α,β”‐Trioxatris‐σ‐homotropone

Abstract

The three stereoisomeric triepoxycycloheptanones (1), which could be transformed, inter alia, into trioxonines and into potentially “tris‐homobenzenoid” carbenium ions, have been synthesized separately: the two “symmetrical” isomers from readily accessible (2), and the unsymmetrical isomer from (3).