摘要:
The reactions of the cyclopentenones 3,4-dimethylcyclopentenone, 1-indanone, and 2-indanone with mono- and dilithioferrocene lead to the synthesis of cyclopentadienyl-substituted ferrocenes: (3,4-dimethyl-cyclopenta-1,3-dienyl)ferrocene (1), (1-indenyl)ferrocene (3), (2-indenyl)ferrocene (4), and 1,1'-bis(3,4-dimethylcyclopenta-1,3-dienyl)ferrocene (2). The crystal structure of compound 2 was determined. The crystal data are as follows: C24H26Fe, triclinic, P1BAR, a = 7.561 (2) angstrom, b = 10.738 (2) angstrom, c = 13.005 (3) angstrom = 102.05 (3)-degrees, beta = 104.29 (3)-degrees, gamma- 108.84 (3)-degrees, V = 919.1 (4) angstrom3, Z = 2, R = 0.0279, and R(W) = 0.0398 on the basis of 2336 reflections with F greater-than-or-equal-to 4-sigma-(F). It displays an unusual cofacial arrangement of the two 3,4-dimethylcyclopenta-1, 3-dienyl rings. The lithium salt of 1 reacts with FeCl2 to give the triferrocenyl bis(1-ferrocenyl-3,4-dimethylcyclopentadienyl)ferrocene (5). The reaction of the dilithium salt of 2 with FeCl2 yields a mixture of polymeric ferrocenes.