Palladium complexes redistribution reactions

Jain, V. K. In Synthesis, Reactivity and Redistribution Reactions of Homo- and Heterobinuclear Palladium(II) and Platinum(II) Complexes. Adv. Organomet. Proceedings Indo-Sov. Symp. Organomet. Chem., 1st. ed. Jain, D. V. S., Ed. Indian Natl. Sci. Acad New Delhi, India 1989, 143-162. 

The lability of the NHC ligands is unexpected. However, few examples of NHC substitution have been reported in the literature. Caddick and Cloke described that phosphines and free carbenes can replace coordinated NHC ligands in palladium-based complexes to give mixed NHC-phosphines complexes (equations 27-29). Treatment of (185) with PCys at room temperature resulted in a quantitative conversion to the mixed complex (186). Similar behavior was observed with the more sterically hindered P(tol)3 with a lower conversion and requiring harsher reaction conditions. Ligand redistribution reaction between (188) and P(tol)s was also found to occur to give (189) in poor but isolable yield (equation 28). This same redistribution reaction was carried out with free F Bu instead of the phosphine and yielded, at room temperature, the two-coordinated mixed NHC-palladium complex (190). These experiments demonstrated that ligand... 

Redistribution reactions between two palladium complexes have also proved useful for the generation of monoarylpalladium species. For example, CsFsPdClfl.S-cod) is obtained from (C6F5)2Pd(THF)2, Cl2Pd(PhCN)2, and 1,5-cyclooctadiene (Scheme 30)P l... 

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