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Asymmetric epoxidation radical addition reactions

On the other hand, the addition of a quaternary ammonium salt to the reaction medium accelerates the isomerization of the radical intermediate [36]. Thus, the epoxidation of c/j-stilbene in the presence of A -benzylquinine salt gives rranr-stilbene oxide with 90% ee as major product (Table 6B.1, entry 24). This protocol provides an effective method for the synthesis of trans-epoxides. In contrast to the epoxidation of c/s-di- and tri-substituted olefins for which complexes 11-13 are the catalysts of choice, the best catalyst for the epoxidation of tetra-substituted conjugated olefins varies with substrates (Table 6B.1, entries 27 and 28) [37]. The asymmetric epoxidation of 6-bromo-2,2,3,4-tetramethylchromene is well-promoted by complex 14 and that of 2-methyl-3-phenylindene, by complex 12a. [Pg.299]


See other pages where Asymmetric epoxidation radical addition reactions is mentioned: [Pg.25]    [Pg.17]    [Pg.417]    [Pg.417]    [Pg.301]    [Pg.43]    [Pg.91]    [Pg.244]    [Pg.254]    [Pg.244]    [Pg.21]    [Pg.21]    [Pg.196]    [Pg.870]    [Pg.614]    [Pg.264]    [Pg.163]   
See also in sourсe #XX -- [ Pg.4 , Pg.751 , Pg.752 , Pg.753 , Pg.754 , Pg.755 , Pg.756 , Pg.757 ]

See also in sourсe #XX -- [ Pg.4 , Pg.751 , Pg.752 , Pg.753 , Pg.754 , Pg.755 , Pg.756 , Pg.757 ]




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Addition epoxidation

Addition reactions asymmetric

Addition reactions epoxidation

Asymmetric addition

Asymmetric epoxidation

Asymmetric epoxidation radicals

Asymmetric radical additions

Asymmetric radicals

Asymmetric reactions epoxidation

Epoxidations, asymmetric

Epoxide reaction

Epoxides addition

Epoxides addition reactions

Epoxides asymmetric epoxidation

Epoxides reactions

Radical epoxidation

Radical reaction addition

Radical reactions asymmetric

Reactions epoxidation

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