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Volumn 131, Issue 30, 2009, Pages 10701-10710

Rationalizing the reactivity of frustrated Lewis pairs: Thermodynamics of H2 activation and the role of acid-base properties

Author keywords

[No Author keywords available]

Indexed keywords

ACID BASE; ACID-BASE PROPERTY; ACTIVE SITE; COOPERATIVITY; DATIVE BONDS; DONOR-ACCEPTOR; DONOR-ACCEPTOR PAIRS; ELECTROSTATIC INTERACTIONS; ENERGY PARTITIONING SCHEMES; HYDROGEN SPLITTING; HYDROGENATION PROCESS; QUANTITATIVE MEASURES; QUANTUM CHEMICAL CALCULATIONS; REACTION FREE ENERGY; STABILIZING EFFECTS; THERMODYNAMIC FEASIBILITY;

EID: 68049110617     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja903878z     Document Type: Article
Times cited : (279)

References (122)
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    • Moleculeswith mesityl substituentsrepresent pathological cases in terms of calculating low frequencynormal modes due to the nearly free rotation of the methyl groups.For a short discussion of this issue, see SupportingInformation.
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    • 3, a color change wasobserved, which points to secondary intermolecular interactions betweenthe molecules. For the latter case, this was also confirmed by NMRchemical shift changes. See refs 8 and 28, respectively.
    • 3, a color change wasobserved, which points to secondary intermolecular interactions betweenthe molecules. For the latter case, this was also confirmed by NMRchemical shift changes. See refs 8 and 28, respectively.
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    • Privalov and coworkers have analyzedH2 uptake by a series of directly linked R2P-BR′2 compounds computationally. The authors pointed out the importanceof destabilizing the intramolecular P-B dative π bondas well as increasing Lewis acidity to achieve lower activation energies-.The exothermicities of the processes were also calculated but notdiscussed in detail. See ref 40
    • 2 compounds computationally. The authors pointed out the importanceof destabilizing the intramolecular P-B dative π bondas well as increasing Lewis acidity to achieve lower activation energies-.The exothermicities of the processes were also calculated but notdiscussed in detail. See ref 40.
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    • It mustbe noted that the precipitationof the product from the solution has been observed during the reactioncourse in most cases. The obviously exergonic crystallization stepprovides additional stabilization for the product, which is not includedin the calculated free energies
    • It mustbe noted that the precipitationof the product from the solution has been observed during the reactioncourse in most cases. The obviously exergonic crystallization stepprovides additional stabilization for the product, which is not includedin the calculated free energies.
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    • More detailsabout the molecular geometriesused to calculate the thermodynamic data are given in the Supporting Information
    • More detailsabout the molecular geometriesused to calculate the thermodynamic data are given in the Supporting Information.
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    • All energydata discussed in our paperare listed in tabular format in the Supporting Information
    • All energydata discussed in our paperare listed in tabular format in the Supporting Information.
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    • 2 lossbut only upon heating in thepresence of pyridine, which shifts the equilibrium due to the formationof the stable pyridine - B adduct; see ref 29.
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    • This reactionis predicted to be highlyexergonic at the PBE/6-31G(d) level as well (ΔG, 7.3 kcal/mol) as reported by Repo, Rieger, and co-workers.See ref 20
    • This reactionis predicted to be highlyexergonic at the PBE/6-31G(d) level as well (ΔG = -7.3 kcal/mol) as reported by Repo, Rieger, and co-workers.See ref 20.
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    • For methodsof determination of Lewisacidity or basicity, see the following papers as well as referencestherein: (a) Denmark, S. E.; Beutner, G. L. Angew. Chem., Int. Ed. 2008, 47, 1560.
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    • + in toluene, see the Supporting Information.
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    • The calculated gas-phase ΔH for this reaction is +398.4 kcal/mol, which is in goodagreement with the experimental value of +400.4 kcal/mol see ref 66
    • The calculated gas-phase ΔH for this reaction is +398.4 kcal/mol, which is in goodagreement with the experimental value of +400.4 kcal/mol (see ref 66).
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    • For a comparison of the calculated valueswith available experimental data, see the SupportingInformation
    • For a comparison of the calculated valueswith available experimental data, see the SupportingInformation.
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    • Group13-15 donor - acceptorcomplex dissociation energies have been studied recently. See: Gille, A. L.; Gilbert, T. M. J. Chem. Theory Comput. 2008, 4, 1681.
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    • a value is proportionalto ΔG of the proton detachment reaction.
    • a value is proportionalto ΔG of the proton detachment reaction.
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    • Reference 63b
    • (d) Reference 63b.
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    • For details,see SupportingInformation
    • For details,see SupportingInformation.
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    • The gas-phasestabilization electronicenergies of nonlinked systems show a notable linear correlation with dDA-1, underlining the importanceof electrostatics see Supporting Information, However, due to the small dDA range,the damping effect of the solvent renders this correlation undetectablein the solvent-phase ΔGstab values
    • stab values.
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    • -].
    • -].


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.