Aspects of this topic are discussed in the following places at Britannica.
...same way as for any organic compound. The number of carbon atoms on a group that are attached to the metal is indicated by the superscript in ηn. This convention is known as hapto nomenclature. A single point of attachment, η1, is usually not explicitly indicated, as in the above formula for dimethylmercury, a monohapto species. The compound with the...
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