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Volumn 133, Issue 22, 2011, Pages 8574-8585

Of the ortho effect in palladium/norbornene-catalyzed reactions: A theoretical investigation

Author keywords

[No Author keywords available]

Indexed keywords

ARYL HALIDES; ARYL-ARYL COUPLING; BIPYRAMIDAL STRUCTURES; DFT CALCULATION; ENERGETIC DIFFERENCES; ENERGY TRANSITION STATE; IN-SITU; METALLACYCLES; NORBORNENES; ORTHO EFFECT; OXIDATIVE ADDITIONS; PALLADACYCLES; PALLADIUM-CATALYZED REACTIONS; REDUCTIVE ELIMINATION; STERIC EFFECT; THEORETICAL INVESTIGATIONS; TRANSITION STATE; TRANSMETALATION;

EID: 79958010991     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja110988p     Document Type: Article
Times cited : (170)

References (138)
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    • Complete citation in Supporting Information.
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    • For sake of clarity and to increase the readability of this paper, in Figures and Tables only the minimum amount of values are plotted (LACVP(d) gas phase). TZVP and solvation values are available in the Section 2 of the Supporting Information. With each reaction Figure, a Table is presented to allow straightforward comparison among all calculated values.
    • For sake of clarity and to increase the readability of this paper, in Figures and Tables only the minimum amount of values are plotted (LACVP(d) gas phase). TZVP and solvation values are available in the Section 2 of the Supporting Information. With each reaction Figure, a Table is presented to allow straightforward comparison among all calculated values.
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    • For a very recent example highlighting the major reliability of hybrid methods to model very large organometallic complexes see: Besora, M.; Braga, A. A. C.; Ujaque, G.; Maseras, F.; Lledòs, A. Theor. Chem. Acc. 2011, 128, 639-646
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    • This Pd(II) complex is likely present in solution, as it is required as well to form I. For theoretical studies on oxidative addition leading to Pd(II) complexes see
    • This Pd(II) complex is likely present in solution, as it is required as well to form I. For theoretical studies on oxidative addition leading to Pd(II) complexes see: Kozuch, S.; Shaik, S.; Jutand, A.; Amatore, C. Chem.-Eur. J. 2004, 10, 3072-3080
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    • See Section 6 of the Supporting Inforamtion. TS(II-III)a and TS(III-IV)a lie 5.5 and 4.5 kcal/mol in Δ G below their octahedrical counterparts, respectively.
    • See Section 6 of the Supporting Inforamtion. TS(II-III)a and TS(III-IV)a lie 5.5 and 4.5 kcal/mol in Δ G below their octahedrical counterparts, respectively.
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    • Our theoretical approach has been successfully adopted to describe dipalladium complexes
    • Our theoretical approach has been successfully adopted to describe dipalladium complexes: Powers, D. C.; Benitez, D.; Tkatchouk, E.; Goddard, W. A., III; Ritter, T. J. Am. Chem. Soc. 2010, 132, 14092-14103.
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    • TS(V-VI)a could be found employing B3LYP and PBE0 functionals. They lie only +0.3 and +0.8 kcal/mol above VIa, respectively.
    • TS(V-VI)a could be found employing B3LYP and PBE0 functionals. They lie only +0.3 and +0.8 kcal/mol above VIa, respectively.
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    • See Supporting Information Section 2. Single-points calculations on these relevant TSs for reactions a-c favor the TM pathway by 0.5-2 kcal/mol.
    • See Supporting Information Section 2. Single-points calculations on these relevant TSs for reactions a-c favor the TM pathway by 0.5-2 kcal/mol.
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    • We modeled also this system, as proposed by Cardenas and Echavarren in their model, but the resulting energies are higher than those reported in Figure 3. This is probably related to the simplified model they employed, where steric congestion was much lower.
    • We modeled also this system, as proposed by Cardenas and Echavarren in their model, but the resulting energies are higher than those reported in Figure 3. This is probably related to the simplified model they employed, where steric congestion was much lower.
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    • See Supporting Information Section 2. Single-points calculations on these relevant TSs for reactions d-f favor the TM pathway by 4-8 kcal/mol.
    • See Supporting Information Section 2. Single-points calculations on these relevant TSs for reactions d-f favor the TM pathway by 4-8 kcal/mol.
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    • Using B3LYP and PBE0 functionals did not allow to determine either the TS or intermediate VIg, and led to a direct connection, although very energetically disfavored, between Vg and TS(VI-VII)g.
    • Using B3LYP and PBE0 functionals did not allow to determine either the TS or intermediate VIg, and led to a direct connection, although very energetically disfavored, between Vg and TS(VI-VII)g.
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    • See Supporting Information Section 2. Single-points calculations on these relevant TSs for reactions g-k favor the Pd(IV) pathway by 8-17 kcal/mol.
    • See Supporting Information Section 2. Single-points calculations on these relevant TSs for reactions g-k favor the Pd(IV) pathway by 8-17 kcal/mol.
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    • 2-Substituted aryl halides have been tested as simplified model substrates for catalytic methods featuring a final intramolecular ring closure, as those of refs 17c-17e.
    • 2-Substituted aryl halides have been tested as simplified model substrates for catalytic methods featuring a final intramolecular ring closure, as those of refs 17c-17e.
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    • The distance, as reported above, is reduced by 0.03 Å only, while this contraction is greater (0.23 Å) when the Me group is replaced by a H atom, as found for Ia and its corresponding TS(II-III)a.
    • The distance, as reported above, is reduced by 0.03 Å only, while this contraction is greater (0.23 Å) when the Me group is replaced by a H atom, as found for Ia and its corresponding TS(II-III)a.
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    • The methyl group in our model, or even much more sterically demanding groups such as the i -Pr, s -Bu, and Ph, were experimentally employed in successful way.
    • The methyl group in our model, or even much more sterically demanding groups such as the i -Pr, s -Bu, and Ph, were experimentally employed in successful way.
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    • Modeled relevant structures evidencing these further H-H close proximity (less than 2 Å) for i,k,n and p systems could be found in the Supporting Information.
    • Modeled relevant structures evidencing these further H-H close proximity (less than 2 Å) for i,k,n and p systems could be found in the Supporting Information.
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    • See Supporting Information Section 2. Single-points calculations on these relevant TSs for reactions l-p favor the Pd(IV) pathway by 1-10 kcal.
    • See Supporting Information Section 2. Single-points calculations on these relevant TSs for reactions l-p favor the Pd(IV) pathway by 1-10 kcal.
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    • See Supporting Information Section 3. Single-points calculations on these relevant TSs for reactions g-p favor in all cases this reductive elimination pathway by 3-16 kcal/mol.
    • See Supporting Information Section 3. Single-points calculations on these relevant TSs for reactions g-p favor in all cases this reductive elimination pathway by 3-16 kcal/mol.
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    • Relevant data for these three reacting carbon atoms and relevant calculated charges for palladium nuclei of both formal Pd(IV) and transmetalation (TM) mechanisms are available in the Section 8 of Supporting Information.
    • Relevant data for these three reacting carbon atoms and relevant calculated charges for palladium nuclei of both formal Pd(IV) and transmetalation (TM) mechanisms are available in the Section 8 of Supporting Information.


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