Journal
ORGANOMETALLICS
Volume 33, Issue 8, Pages 1964-1971Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om4012104
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- Research Corporation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1149875] Funding Source: National Science Foundation
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Reductive elimination from U(CH2Ph)(4) (1-Ph) mediated by 4,6-di-tert-butyl-2-[(2,6-diisopropylphenyl)imino]quinone ((dipp)iq) was observed, resulting in the formation of ((dipp)ap)(2)U(CH2Ph)(2)(THF)(2) (2) ((dipp)ap = 4,6-di-tert-butyl-2-[(2,6-diisopropylphenyl)amido]phenolate) and bibenzyl. The crossover experiment with U(CD2C6D5)(4) showed formation of bibenzyl-d(7), indicating that reductive elimination occurs in a stepwise fashion via benzyl radical extrusion, presumably through an iminosemiquinone tris(benzyl) intermediate, ((dipp)isq)U(CH2Ph)(3). Synthesis of this intermediate was attempted by addition of the iminoquinone ligand to UI3(THF)(4) to form ((dipp)isq)UI3 (3), followed by alkylation with 3 equiv of benzylpotassium. However, this only resulted in the isolation of 2. Reduction of 3 with KC8 afforded the amidophenolate diiodide species ((dipp)ap)UI2(THF)(2) (4), maintaining the tetravalent oxidation state of the uranium and reducing the ligand. Attempts at the formation of 2 via addition of 2 equiv of benzylpotassium to 4 resulted in decomposition. The uranium mono(alkyl) ((dipp)ap)UI(CH2Ph)(THF)(2) (5) was observed upon addition of 1 equiv of benzylpotassium to 4. All products have been characterized by H-1 NMR and electronic absorption spectroscopy. X-ray crystallography was employed to ascertain ligand reduction in 2, 3, and S.
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