W. Evans, D. A. Cano, M. A. Greci
Mar 13, 1999
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0
Influential Citations
8
Citations
Journal
Organometallics
Abstract
Tris(peralkylcyclopentadienyl)samarium complexes containing two rings connected by a Me2Si group were synthesized for comparison with (C5Me5)3Sm. SmI3 reacts with Me2Si(C5Me4K)2 in THF to make Me2Si(C5Me4)2SmI(THF) (1) in >90% yield. 1 reacts with KC5Me5 in toluene to make Me2Si(C5Me4)2Sm(C5Me5) (2a) and in THF to make Me2Si(C5Me4)2Sm(C5Me5)(THF) (2b). 1 reacts with KC5Me4Et, KC5Me4nPr, and KC5Me4iPr in toluene to make Me2Si(C5Me4)2Sm(C5Me4Et) (3), Me2Si(C5Me4)2Sm(C5Me4nPr) (4), and Me2Si(C5Me4)2Sm(C5Me4iPr) (5), respectively. In contrast to the reactivity of (C5Me5)3Sm, complexes 2a and 3−5 do not ring-open THF, do not reduce 1,3,5,7-C8H8 or Ph3PSe, and do not polymerize ethylene at 50 psi. Structural data were obtained on 1, 2a, 2b, and 4. The (ring centroid)−metal−(ring centroid) angles of the Me2Si(C5Me4)2 units in each structure range from 115.2° (2b) to 123.3° (1) and have average Sm−C(ring) distances of 2.70(6) A (1), 2.82(10) A (2a), 2.92(14) A (2b), and 2.83(10) A (4). The average Sm−C(C5Me4R) di...