Preparation of derivatives of tricyclo[4.2.0.01,4]octane, broken window compounds

Abstract
Photolysis of 3-(3-methylbut-3-enyl)cyclopent-2-enone (4) leads to the tricyclo [5.2.0.01,5]nonane (5); the derived diazoketone (7) undergoes Wolff rearrangement to give esters (8) and (9), derivatives of tricyclo [4.2.0.01,4]octane (1).

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