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• W2333112830 endingPage "6805" @default.
• W2333112830 startingPage "6798" @default.
• W2333112830 abstract "NMR spectroscopic studies have been performed on the mixed complexes formed by the lithium salt of acetonitrile (LiCH2CN) and the chiral lithium amides Li−(S)-N-(2-methoxybenzyl)-1-amino-1-phenyl-2-ethoxyethane (Li-1) and Li−(S)-N-isopropyl-2-amino-1-phenyl-3-methoxypropane (Li-2) in diethyl ether and tetrahydrofuran solvent. In diethyl ether Li-1 and LiCH2CN form a mixed dimeric (1:1) complex, while Li-2 and LiCH2CN form a mixed trimeric (2:1) complex. The dimer undergoes fast exchange between ketenimine and bridged structures. Both 1J(15N,6Li) and 1J(13C,6Li) couplings were observed for the respectively isotopically labeled compounds. In the trimeric complex the CH2CN anion also undergoes fast degenerate exchange between ketenimine and bridged structures, and the complex appears C2-symmetric on the NMR spectroscopy time scale. Both the dimer and trimer complexes have the bridged acetonitrile anion in common, as indicated by the highly shielded α-carbon 13C NMR shifts (δ −6.1 and −7.4, respectively). In tetrahydrofuran only N-metalated mixed LiCH2CN dimers were observed for both Li-1 and Li-2 with the less shielded 13C NMR shifts of δ −2.5 and −2.2 for the α-carbon of LiCH2CN of the complexes." @default.
• W2333112830 created "2016-06-24" @default.
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• W2333112830 date "2004-05-05" @default.
• W2333112830 modified "2023-10-09" @default.
• W2333112830 title "Mixed Complexes Formed by Lithioacetonitrile and Chiral Lithium Amides: Observation of ⁶Li,¹⁵N and ⁶Li,¹³C Couplings Due to Both C−Li and N−Li Contacts" @default.
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• W2333112830 doi "https://doi.org/10.1021/ja0388461" @default.
• W2333112830 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15161308" @default.
• W2333112830 hasPublicationYear "2004" @default.
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