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Diastereoselective Template Synthesis on Iron and Uranium

Journal Article · · Organometallics

The addition of 2 equiv of tBu2PSiMe3 to 2,6-pyridinedicarboxaldehyde ((CHO)2Py) results in a rac/meso diastereomeric mixture of the PNP-chelating ligand 2,6-bis((trimethylsiloxy)(di-tert-butylphosphino)-methyl)-pyridine ((OTMS)PNPtBu) (1-r/m) via addition of the P–Si bond across both of the aldehyde C–O bonds. Chelation of (OTMS)PNPtBu to FeCl2 results in the same diastereotopic ratio of ((OTMS)PNPtBu)FeCl2 (2-r/m) as the free ligand. Fractional crystallization allows for the isolation of the C2 isomer, 2-r, and a template synthesis protocol allows for the synthesis and isolation of the Cs isomer, 2-m, in good yield. Furthermore, the template synthesis protocol was also expanded to the f-block with the use of UCl4 in order to assess the specificity of the template synthesis on a larger metal cation. This reaction performed on UCl4 forms the meso diastereospecific uranium complex ((tBu2P)ONO)UCl2(dtbpy), 3-m, with observation of the rational intermediate ((OTMS)PNOtBu)UCl3(dtbpy), 4-m, which arose from the respective formation of two- or one-equivalents of TMS–Cl and formation of the corresponding U–O bond.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1812669
Report Number(s):
LA-UR-21-20777
Journal Information:
Organometallics, Vol. 40, Issue 15; ISSN 0276-7333
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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