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Volumn , Issue 5, 2007, Pages 675-683

CO2 fixation by alkylzinc amides: A quantum chemical study motivated by recent experimental results

Author keywords

CO2 fixation; Quantum chemical calculations; Reaction mechanisms; Zinc

Indexed keywords

ACTIVATION ENERGY; AMIDES; DIMERS; ELECTRONIC PROPERTIES; MONOMERS; QUANTUM CHEMISTRY; REACTION INTERMEDIATES; ZINC; ZINC COMPOUNDS;

EID: 34250834392     PISSN: 14341948     EISSN: 10990682     Source Type: Journal    
DOI: 10.1002/ejic.200600840     Document Type: Article
Times cited : (12)

References (42)
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    • 2 fails to remain wholly intact in arene solution and a dynamic monomer-dimer equilibrium exists. See: D. R. Armstrong, G. C. Forbes, R. E. Mulvey, W. Clegg, D. M. Tooke, J. Chem. Soc., Dalton Trans. 2002, 1656.
    • 2 fails to remain wholly intact in arene solution and a dynamic monomer-dimer equilibrium exists. See: D. R. Armstrong, G. C. Forbes, R. E. Mulvey, W. Clegg, D. M. Tooke, J. Chem. Soc., Dalton Trans. 2002, 1656.
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    • 2r symmetry, but the mirror plane changes.
    • 2r symmetry, but the mirror plane changes.
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    • Calculations were also carried out for CO2 fixation by the analogue magnesium model compound HMgNH2 to obtain information on the effect that variation of the metal atom brings about. This reaction was shown to follow the same pattern as that of the Zn compound. The vertical approach again leads to a small minimum, which this time adopts a Mg-N-C angle of 109.8° and an energy relative to the sum of the energies of the separated reactants of -25 (BP/SVP) or -6 kJ·mol-1 (BP/TZVPP, The interatomic distances (Mg-N 191.6, C-O 117.3, C⋯N 302.3 pm) and the O-C-O angle (176.1°) again indicate that the geometries of the two reactants are only slightly influenced by this adduct formation. The intermediate featuring a four-membered Mg-N-C-O ring formed in the course of the parallel approach now exhibits a relative energy of -127 (BP/SVP) or -79 kJ·mol-1 BP/TZVPP, It is reached at a Zn-N-C angle of 8
    • -1 (BP/TZVPP) the overall reaction energy for carbamate formation is almost twice as large as that for the Zn compound.


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