Cyclopentadienyl -aryloxo

With the exception of a few rare examples from the chemistry of molybdenum, manganese, rhenium, iron, and ruthenium, chelate complexes of O-func-tionalized cyclopentadienyl ligands have only been reported in this category for the very oxophilic group 4 metals, preferentially in their highest and most Lewis acidic oxidation state. Linked alkoxo— or aryloxo—cyclopentadienyl and ether—cyclopentadienyl systems are almost equally abundant for these metals. 

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