Cubane: spot the wrong reaction class

Single question

Cage-closing step in the Eaton cubane route: a bis-enone diene precursor is supposedly cyclized to the cubane skeleton in one step. The atoms balance. Check the reaction class.

Photochemical [2+2] cycloaddition vs Friedel-Crafts

Eaton cubane synthesis

Why aromatic-ring chemistry does not apply to all-sp3 cages

Find the flaw

Click the step that contains the flaw, or pick “No flaw” if you think every step is correct.

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