The addition occurs at opposite poles of C 70 when two Ir complexes each coordinate in a dihapto fashion to a 6‐6 ring junction to form the title compound. Although the splitting of the 31 P NMR signals of this complex at low temperatures implies that an isomeric mixture is present, X‐ray studies on the products of different batches reveal only one isomer in the solid state.
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Balch et al. (1992) studied this question.