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Reaction of bisbenzenechromium (I)-cation with strong bases yields - in addition to diamagnetic products - a paramagnetic species for which the structure of (π-C 6 H 6 ) Cr ⊕  (π-C 6 H 5  ⊖ ) is suggested on the basis of ESR spectroscopic evidence. The ESR spectrum also indicates an intramolecular, interannular proton exchange with a frequency of the order 10 7  sec -1 .

ESR-spektroskopische Untersuchung der Deprotonierung von Dibenzolchrom(I)-Kation / ESR-Study of the Deprotonation of Bisbenzenechromium (I)-Cation