A pair of seven-membered chelate rings are found in the palladium(IV) complex assembled in only a single step from commercially available [Pd2(dba)3], tetrachloro-1,2-benzoquinone, and norbornene. The structure consists of a C2-symmetrical palladaspirocycle framework and an ether ligand, as confirmed by X-ray analysis of the thf complex (see picture).
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Yamamoto et al. (2002) studied this question.