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One factor: since ferrocene is covalently bonded, the rings "communicate" with each other via the molecular orbitals passing through the iron atom. Thus the acetyl group placed on one ring not only deactivates that ring, but to some extent deactivates the second ring as well. The second ring would still be attacked preferentially in the second stage but ...


Grignards react with molecular oxygen to form hydroperoxides. According to this paper here the yield for alkyl hydroperoxides can be as high as 90%, yields from aryl Grignards are lower (10-20%).

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