Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In organometallic chemistry, the indenyl effect refers to the enhanced rates of substitution displayed by 5-indenyl complexes vs the related 5- cyclopentadienyl complexes.Associative substitution occurs by the addition of a ligand to a metal complex followed by dissociation of an original ligand. Associative pathways are not typically seen in 18- electron complexes due to requisite intermediates having more than 18 electrons. 18 electron indenyl complexes; however, have been shown to undergo substitution via associative pathways quite readily. This is attributed to the relative ease 5 to 3 rearrangement due to stabilization by the arene. This stabilization is responsible for substitution rate enhancements of about 108 for the substitution of indenyl complexes compared to the corresponding cyclopentadienyl complex.

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