Synthesis and Isolation of σ-Bonded Fullerene Metal Derivatives from Reactions of Fullerene Dianion C602- with Organometal Halides

Two novel fullerene derivatives (μ-C 60 )Mo 2 (CO) 6 (η 5 -C 5 H 4 CO 2 Et) 2 (1) and (μ-C 60 )W 2 (CO) 6 (η 5 -C 5 H 4 CO 2 Me) 2 (2) were isolated from reactions of a tetrahydrofuran (THF) solution of dianion C 60 2 -, derived from C 60 and potassium as well as α-methylnaphthalene, in situ with (η 5 -C 5 H 4 CO 2 Et)Mo(CO) 3 Cl and (η 5 -C 5 H 4 CO 2 Me)W(CO) 3 Cl, respectively (Scheme 1). The new complexes, in which the organometallic groups are attached at the 1,4-positions of C 60 via assigned Mo−C(C 60 ) σ-bonds, were characterized by elemental analysis and spectroscopic methods.