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Manganese-catalyzed epoxidation

The results obtained in the manganese-catalyzed epoxidation reactions of various olefins are shown in Table 24. [Pg.453]

TABLE 24. Manganese-catalyzed epoxidation of olefins using hydrogen peroxide as oxygen source... [Pg.454]

In subsequent research, it turned out that two-state reactivity can also provide a concept for the understanding of oxidation reactions way beyond the scope of gas-phase ion chemistry and can actually resolve a number of existing mechanistic puzzles. In enzymatic oxidations involving cytochrome P450, for example, changes in spin multiplicity appear to act as a kind of mechanistic distributor for product formation [27-29], and in the case of manganese-catalyzed epoxidation reactions, two-state scenarios have been put forward to account for the experimentally observed stereoselectivities [30-32], Two-state reactivity is not restricted to oxidation reactions, and similar scenarios have been proposed for a number of other experimentally studied reactions of 3d metal compounds [33-37]. Moreover, two-state scenarios have recently also been involved in the chemistry of main group elements [38]. The concept of two-state reactivity developed from the four-atomic system FeO /H2... [Pg.14]

Muniz-Fernandez, K., Bolm, C. Manganese-catalyzed epoxidations. Transition Metals for Organic Synthesis 1998, 2, 271-282. [Pg.607]

The development of Mn-catalyzed epoxidation methods have provided useful methods for the stereocontrolled epoxidation of olefins. Evidence for a peroxy-Mn complex as a key intermediate in high valent manganese catalyzed epoxidations has been proposed <05JA17170>. [Pg.81]

The apo-carbonic anhydrase, as well as other manganese-chelating agents, inhibit this epoxidation. Adding apo-carbonic anhydrase to a manganese-catalyzed epoxidation of 4-vinylbenzoic acid inhibited the reaction [46]. This observation is consistent with the binding of free manganese by the apo-enzyme and a slower epoxidation... [Pg.52]

Whereas several catalytic methods are currently available for manganese-catalyzed epoxidation with aqueous H2O2, high turnover numbers for cis-dihydroxylation reactions so far have only been achieved with osmium compounds 161-165). However, manganese-catalyzed oxidation reactions have a few inherent advantages, such as the low price of the manganese salts and complexes and their non-toxic nature. [Pg.66]

Figure 7.6 Manganese-catalyzed epoxidation with H2O2 in water. Figure 7.6 Manganese-catalyzed epoxidation with H2O2 in water.

See other pages where Manganese-catalyzed epoxidation is mentioned: [Pg.201]    [Pg.201]    [Pg.203]    [Pg.205]    [Pg.207]    [Pg.442]    [Pg.445]    [Pg.442]    [Pg.445]    [Pg.200]    [Pg.206]    [Pg.203]    [Pg.134]    [Pg.445]    [Pg.47]    [Pg.47]    [Pg.49]    [Pg.51]    [Pg.762]    [Pg.28]    [Pg.29]    [Pg.31]   
See also in sourсe #XX -- [ Pg.47 ]




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