Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 12, Pages 4074-4078Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201600158
Keywords
carbon dioxide; carbon disulfide; cyanates; nitrides; uranium
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Funding
- Swiss National Science Foundation
- Ecole Polytechnique Federale de Lausanne (EPFL)
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Thermolysis of the nitride-bridged diuranium(IV) complex Cs{(-N)[U(OSi((OBu)-Bu-t)(3))(3)](2)} (1) showed that the bridging nitride behaves as a strong nucleophile, promoting N-C bond formation by siloxide ligand fragmentation to yield an imido-bridged siloxide/silanediolate diuranium(IV) complex, Cs{(-(NBu)-Bu-t)(-O2Si((OBu)-Bu-t)(2))U-2(OSi((OBu)-Bu-t)(3))(5)}. Complex 1 displayed reactivity towards CS2 and CO2 at room temperature that is unprecedented in f-element chemistry, affording diverse N-functionalized products depending on the reaction stoichiometry. The reaction of 1 with two equivalents of CS2 yielded the thiocyanate/thiocarbonate complex Cs{(-NCS)(-CS3)[U(OSi((OBu)-Bu-t)(3))(3)](2)} via a putative NCS-/S2- intermediate. The reaction of 1 with one equivalent of CO2 resulted in deoxygenation and N-C bond formation, yielding the cyanate/oxo complex Cs{(-NCO)(-O)[U(OSi((OBu)-Bu-t)(3))(3)](2)}. Addition of excess CO2 to 1 led to the unprecedented dicarbamate product Cs{(-NC2O4)[U(OSi((OBu)-Bu-t)(3))(3)](2)}.
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