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Volumn , Issue 5, 2003, Pages 960-968

Dynamic behavior of an N-metalated Β-enaminoimine complex - Preparation of N-phosphanylenamine and Β-enaminoimine derivatives

Author keywords

Imines; Metallocenes; N ligands; NMR spectroscopy; Transmetalation; Zirconium

Indexed keywords

COMPLEXATION; CRYSTAL ATOMIC STRUCTURE; HYDROGEN BONDS; LIGANDS; ORGANOMETALLICS; ZIRCONIUM;

EID: 0037345917     PISSN: 14341948     EISSN: None     Source Type: Journal    
DOI: 10.1002/ejic.200390128     Document Type: Article
Times cited : (5)

References (64)
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    • Note that the NH proton resonance occurred at a considerably higher field than in previously reported β-enaminoimine systems,[3,6] possibly due to the presence of the zirconated metal fragment bonded to the nitrogen atoms.[7]
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    • 13C NMR [CH(1)]: For the cis-cis configuration, 130 ppm < δ < 150 ppm. For the trans-trans configuration 90 ppm < δ < 110 ppm; see ref.[11]
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    • Alternative structures for 2 which involve the formation of dimers, trimers, or oligomers with the zirconated metal fragment cannot be totally ruled out, but it is highly unlikely as it will prevent any fluxional process within the alkylideneamido subunit.
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    • Rate constants were derived from band-shape analysis using the software MEXICO (available from A. D. Bain, Department of Chemistry, McMaster University, Hamilton, Ontario, Canada). NMR parameters were optimized to match the simulated and the experimental data. Activation parameters were determined by a standard Eyring analysis.
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    • 2] at 293 K revealed two "half-hydrogen" atoms in the N⋯N region of the molecule, similar to what might be obtained by the superposition of one half molecule of A′ on one half molecule of A″.
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    • The representation of β-enaminoimine systems as a symmetrically hydrogen-bonded structure, earlier described as an aromatic six-πi-electron system, should be excluded for these compounds; see: [24a] P. Goldstein, K. N. Trueblood, Acta Crystallogr. 1967, 23, 148-156. [24b] J. E. Parks, R. H. Holm, Inorg. Chem. 1968, 7, 1408-1416.
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    • The representation of β-enaminoimine systems as a symmetrically hydrogen-bonded structure, earlier described as an aromatic six-πi-electron system, should be excluded for these compounds; see: [24a] P. Goldstein, K. N. Trueblood, Acta Crystallogr. 1967, 23, 148-156. [24b] J. E. Parks, R. H. Holm, Inorg. Chem. 1968, 7, 1408-1416.
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    • A very low activation barrier has to be assumed for the tautomeric process in β-enaminoimine derivatives.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.