Synthese und eigenschaften von cyclooctatetraencyclopentadienylchrom(I)

Abstract Paramagnetic C 5 H 5 CrC 8 H 8 was synthesized by the reaction of C 5 H 5 CrC 2 ·THF with C 8 H 8 in the presence of i-C 3 H 7 MgBr. The π-bonded eight-membered. ring contains a free double bond. From NMR data it appears that the ligand undergoes quick rotation. C 5 H 5 CrC 8 H 8 is protonated by HPF 6 to form the C 5 H 5 CrC 8 H 9 + ion. The cation is capable of adding nucleophiles to give derivatives of C 5 H 5 CrC 8 H 10 .