Challenges in cyclometalation: steric effects leading to competing pathways and η,η-cyclometalated iridium(iii) complexes.

Dalton Trans

Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.

Published: October 2018

The iridation of (R)-N,N-dimethyl-1-(1-naphthyl)ethylamine in the presence of a base afforded an assortment of products ranging from organic molecules to coordinated systems and cyclometalated complexes. The transformation affirmed the postulation where steric effects within the coordination sphere favor a β-hydride elimination-like decomposition pathway, competing alongside ortho-metalation, thus leading to iminium intermediates. The same procedure also generated an unprecedented carbocyclic η,η-cycloiridated species that could not be attained from the direct cyclometalation of its organic ligand.

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http://dx.doi.org/10.1039/c8dt02639dDOI Listing

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