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Abstract
AbstractThe formolysis of cis‐ and trans‐ditosylates 7a and 7b yielded the mixed esters 13 (at 55°C) or the diols 11 (at 100°C, after LAH reduction) by single and double ring expansion, respectively. The reactions are stereoselective, occurring with retention of configuration, which points to the intermediacy of phenonium ions.
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