The generation of the [V(cp)2]+ unit (cp =η5-C5H5) in basic solvents such as water, acetone (L), and pyridine (L) leads to the isolation of [V(cp)2L]+[BPh4]– paramagnetic complexes, whose high π-basicity toward π-acids is shown by the ready carbonylation of aqueous solutions of [V(cp)2Cl] to give [V(cp)2(CO)2]+ quantitatively.
G. Fachinetti and C. Floriani, J. Chem. Soc., Chem. Commun., 1975, 578 DOI: 10.1039/C39750000578
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