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Volumn 132, Issue 38, 2010, Pages 13229-13239

Cis-dihydroxylation of alkenes with oxone catalyzed by iron complexes of a macrocyclic tetraaza ligand and reaction mechanism by ESI-MS spectrometry and DFT calculations

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVATION BARRIERS; ACTIVE CATALYST; ALKENE SUBSTRATE; CIS-DIOL; CIS-DIOLS; CYCLOOCTENE; DEMETALATION; DFT CALCULATION; DIHYDROXYLATION; DIHYDROXYLATION REACTION; DIMETHYL FUMARATE; ELECTRON-DEFICIENT; ELECTRON-RICH ALKENES; IN-SITU; IRON CATALYST; IRON COMPLEX; ISOTOPE LABELING; LINEAR ALKENES; MACROCYCLICS; MECHANISTIC STUDIES; METHYL CINNAMATE; MOLAR RATIO; REACTION MECHANISM; ROOM TEMPERATURE; SUBSTRATE CONVERSION; UNSATURATED ESTERS; UNSATURATED KETONES;

EID: 77957121071     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja100967g     Document Type: Article
Times cited : (126)

References (91)
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    • 2O (5:1 v/v) at room temperature for 1 h, which gave a 73% substrate conversion and a 74% mass balance (both substantially higher than those obtained for catalyst 1 (entry 8, Table 1)) but still afforded epoxide II as the major product (49% yield based on consumed substrate), with cis-diol I and α-hydroxy ketone III formed in 9% and 16% yields, respectively
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    • In the conversion of CP1 to CP2 via TS, the alkene group of 3i is attacked mainly by the oxo group of intermediate A. An alternative pathway is the initial attack of the alkene group mainly by the hydroxo group of A, but this pathway was found to have a higher barrier (for more detail, see Figure S15 in the Supporting Information)
    • In the conversion of CP1 to CP2 via TS, the alkene group of 3i is attacked mainly by the oxo group of intermediate A. An alternative pathway is the initial attack of the alkene group mainly by the hydroxo group of A, but this pathway was found to have a higher barrier (for more detail, see Figure S15 in the Supporting Information).
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    • 2 = 4.63), rendering it hard to obtain an accurate energy of TS2 by the theoretical method (B3LYP) employed in our study (the calculated free energy of TS2 is lower by 4.2 kcal/mol than that of CP2 due to the underestimation of TS2 energy resulting from spin contamination). For this reason, TS2 is not shown in Figure 3. The calculated structure of this transition state is depicted in Figure S14 in the Supporting Information
    • 2 = 4.63), rendering it hard to obtain an accurate energy of TS2 by the theoretical method (B3LYP) employed in our study (the calculated free energy of TS2 is lower by 4.2 kcal/mol than that of CP2 due to the underestimation of TS2 energy resulting from spin contamination). For this reason, TS2 is not shown in Figure 3. The calculated structure of this transition state is depicted in Figure S14 in the Supporting Information.
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    • 3 used in the reaction). Upon increasing pH from 7 to 8-9, a decrease in the efficiency of cis-dihydroxylation was found (substrate conversion: from 89% to 60%, yield of cis-diol I: from 44% to 25%, yield of epoxide: from 19% to 22%). We noted that 1 became significantly less stable at pH 8-9
    • 3 used in the reaction). Upon increasing pH from 7 to 8-9, a decrease in the efficiency of cis-dihydroxylation was found (substrate conversion: from 89% to 60%, yield of cis-diol I: from 44% to 25%, yield of epoxide: from 19% to 22%). We noted that 1 became significantly less stable at pH 8-9.


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