The mononuclear species 2 ([Rh]C5H5(iPr3P)Rh, RH) can be regarded as a “metallaallene” having numerous coordination possibilities. In 3 the CCH2 group bridges a hetero metal-metal bond, and in 1, 2 is bonded to Rh like an alkene or alkyne.
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Werner et al. (1984) studied this question.
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