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Irradiation of the symmetrical dimer Re(CO)3(bpy)(μ2-dppene)Re(CO)3(bpy)2+ in the presence of a coordinating group, L, results in only a single CO substitution due to internal quenching. The product unsymmetrical dimers are valuable precursors for linear oligomer preparation.
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DelNegro et al. (2001) studied this question.
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