The ligands 2,3,5,6-tetraphenylphenoxide and 3,5-dimethyl-2,6-diphenylphenoxide undergo intramolecular aromatic C–H bond activation by tantalum alkylidene groups at rates 20 and 100 times slower than simple 2,6-diphenylphenoxide.
M. A. Lockwood, J. R. Clark, B. C. Parkin and I. P. Rothwell, Chem. Commun., 1996, 1973 DOI: 10.1039/CC9960001973
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