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- W1982210246 abstract "The air-stable chiral diphosphine chelate ligand R,R-QuinoxP (L; 2,3-bis(tert-butylmethylphosphino)quinoxaline) as developed by Imamoto et al. has been used to obtain the crystallographically characterized complexes (L)PtCl2 (1), (L)PdCl2 (2), and (L)Re(CO)3Cl (3). Coordination was found to occur via the P donor atoms, as indicated by crystal structures and NMR studies; the quinoxaline N donors do not participate in any coordination to the metals. The stereochemical arrangements observed illustrate the enantioselectivity reported for catalysis involving complexes of L. Electron acceptance by the quinoxaline heterocycle is responsible not only for the improved stability of L toward air but also for rather facile reduction of the complexes to the persistent radical anions 1•− and 3•−. In contrast, the reduction to 2•− proceeds irreversibly even at 243 K in the absence of excess chloride. EPR, UV–vis, and IR spectroelectrochemistry was used, when possible, to establish the spin location in the quinoxaline π system with rather small contributions from the metals or the phosphorus nuclei." @default.
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- W1982210246 date "2008-01-01" @default.
- W1982210246 modified "2023-10-14" @default.
- W1982210246 title "Structures and Redox Properties of Metal Complexes of the Electron-Deficient Diphosphine Chelate Ligand <i>R</i>,<i>R</i>-QuinoxP" @default.
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- W1982210246 doi "https://doi.org/10.1021/om700755y" @default.
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