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Volumn 126, Issue 44, 2004, Pages 14493-14505

Spirocyclic zwitterionic λ5Si-silicates with two bidentate ligands derived from α-amino acids or α-hydroxycarboxylic acids: Synthesis, structure, and stereodynamics

Author keywords

[No Author keywords available]

Indexed keywords

ACIDS; NUCLEAR MAGNETIC RESONANCE; SILICATES; SINGLE CRYSTALS; SYNTHESIS (CHEMICAL); X RAY DIFFRACTION;

EID: 7744223931     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja047248z     Document Type: Article
Times cited : (31)

References (57)
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    • note
    • Absolute configurations of the compounds studied: rac-3 and rac-6, racemic mixtures consisting of (Λ)- and (Δ)-enantiomers; 4a, Sa, and 7a-9a, (Λ,S,S)-configuration; 4b, Sb, and 7b-9b, (Δ,S,S)- configuration.
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    • Patai, S., Rappoport, Z., Eds.; Wiley: Chichester, U.K.
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    • note
    • In the case of 4b, an additional intermolecular N1-H1⋯O3 interaction could be discussed (N1-H 0.888 Å, H⋯O3 2.637 Å, N1⋯O3 3.405 Å, N1-H⋯O3 145.21°) that leads to a cross-linkage of the chains built up by the N2-H⋯O4 hydrogen bonds to give a two-dimensional network. However, the H⋯O3 distance is slightly longer than the default cutoff value implemented in the program system PLATON.
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    • Apart from some remaining dichloromethane (solvent for the synthesis), the sample was NMR-spectroscopically pure. The dichloromethane could not be totally removed in vacuo at 60 °C, and drying at higher temperatures resulted in a partial decomposition. These problems, together with the hydrolytic sensitivity of the sample, are responsible for the unsatisfactory results obtained in the elemental analyses.
  • 49
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    • Program system TURBOMOLE: Ahlrichs, R,; Bär, M,; Häser, M,; Horn, H,; Kölmel, C. Chem. Phys. Lett. 1989, 162, 165-169. Optimized TZP basis sets used for (Δ)-11, 12b, and 13a; Si, (12s9p1d)/[7s5p1d]; F, O, N, and C, (10s6p1d)/[6s3p1d]; H, (5s1p)/[3s1p], Optimized TZP+ basis sets (with additional polarization functions) used for the anionic model species 10: Si, (13s10p1d)/[8s6p1d]; F and O, (11s7p1d)/[7s4p1d]; H, (6s2p)/[4s2p].
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    • note
    • 5Si-silicates containing one bidentate ethene-1-aminato-2-olato ligand, two fluoro ligands, and one ammoniomethyl moiety bound to the Si-coordination center.
  • 55
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    • note
    • 5Si-silicates containing one bidentate ethene-1-aminato-2-olato ligand, two fluoro ligands. and one hydrido ligand bound to the Si-coordination center.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.