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Phenol or p -cresol is bound to osmium(II) and combined with an aldehyde to generate remarkably stable η 2 -coordinated o -quinone methide complexes. When these materials are treated with an oxidant (CAN, Cu(II)), the o -quinone methide is liberated and can be trapped with suitable alkenes to generate chromans.
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Stokes et al. (2003) studied this question.
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