1262501-01-8Relevant academic research and scientific papers
Synthesis, structure, and reactivity of the sterically crowded complex (C5Me4SiMe3)3U
Siladke, Nathan A.,Ziller, Joseph W.,Evans, William J.
, p. 2347 - 2351 (2010)
The unusual chemistry obtainable from sterically crowded (C 5R5)3M complexes has been explored with M = U and (C5Me4SiMe3)1-, a ligand that has independently provided unexpected uranium chemistry. (C5Me 4SiMe3)2UMe2 (1), is reduced by potassium to generate the "ate" salt (C5Me 4SiMe3)2UMe2K (2), which reacts with [HNEt3][BPh4] to yield the cationic species [(C 5Me4SiMe3)2U][BPh4] (3). KC5Me4SiMe3 reacts with 3 in benzene to form (C5Me4SiMe3)3U, (4). The structure of 4 shows that the displacement of the methyl groups from the cyclopentadienyl ring planes, a useful indicator of steric crowding, is the largest ever observed in a (C5R5)3M complex. The reactivity of 4 is consistent with this structural indicator in that it engages in THF ring opening to form (C5Me4SiMe3)2UO[(CH 2)4(C5Me4SiMe3)](THF).
