Reactivity of Metal-Azolyl Complexes

CHAPTER 4 COVALENT (x-TYPE) LIGANDS BOUND THROUGH METAL-HETEROATOM BONDS 

Tf s-pyrrolyl complexes are stable due to the polyhapto binding mode, but they are less stable than iq -cyclopentadienyl compounds. It remains controversial whether this difference in stability stems from a thermodynamic or kinetic effect.Nevertheless, the high stability of ri -pyrrolyl complexes allows several chemical modifications to be performed directly on the five-membered ring. ° Lithiation and alkylation of the resulting anion is shown in Equation 4.29.  

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