Abstract
The Pd-PEPPSI complexes widely used to catalyze numerous reactions eliminate the pyridine ligand on treatment with protic acids to give binuclear complexes [Pd(NHC)X2]2 with the Pd–X–Pd (X = Cl, Br, I) bridging bonds. The reaction proceeds with high yields (78–98%) and can be regarded as a preparative approach to binuclear complexes. A prolonged heat treatment of either Pd-PEPPSI complexes or binuclear [Pd(NHC)X2]2 complexes in the presence of strong protic acids results in the Pd–NHC bond cleavage to give azolium salts (proligands) and palladium salts.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1196–1201, July, 2018.
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Chernenko, A.Y., Pasyukov, D.V., Astakhov, A.V. et al. Reactions of Pd-PEPPSI complexes with protic acids. Russ Chem Bull 67, 1196–1201 (2018). https://doi.org/10.1007/s11172-018-2201-9
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DOI: https://doi.org/10.1007/s11172-018-2201-9