Li-2-(1,3-di-tert.-butylimidazol-2-ylidene)lithium 1,2,4-tris(trimethylsilyl)cyclopentadienide Arduengo, A. J., III; Tamm, M.; Calabrese, J. C.; Davidson, F.; Marshall, W. J. Chem. Letters, 1999, 1021.
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