MOB tactics: A novel oxidation of masked o-benzoquinones (MOBs) 1 occurs by singlet-oxygen-triggered ring contraction to form cyclopentenone derivatives 2 and by [4+2] cycloaddition to give endoperoxides 3. The competing pathways are directed by solvents and allow access to a variety of functionalized cyclopentenes.
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Kao et al. (2008) studied this question.
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