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Trimethylamine JV-oxide

A reaction of trimethylamine JV-oxide with a large excess of lithium diiso-propylamide (LDA) in tetrahydrofuran at — 78°C generates C-unsubstituted azomethine ylide 121. The ylide intermediate 121 is reactive so as to undergo smooth cycloadditions to nonactivated olefinic dipolarophiles, such as... [Pg.278]

The cooxidant in this case is trimethylamine-Af-oxide. which often leads to higher yields with sterically hindered alkenes relative to the more usual Af-methylmorpholine-jV-oxide (NMO).25 0.05 eq. Os04, Me,NO, AcOH. TIIF/H20, 0 C-> RT. 76%. [Pg.156]

See other pages where Trimethylamine JV-oxide is mentioned: [Pg.52]    [Pg.234]    [Pg.58]    [Pg.72]    [Pg.692]    [Pg.266]    [Pg.737]    [Pg.206]    [Pg.52]    [Pg.234]    [Pg.58]    [Pg.72]    [Pg.692]    [Pg.266]    [Pg.737]    [Pg.206]    [Pg.95]    [Pg.227]    [Pg.431]    [Pg.127]    [Pg.111]    [Pg.70]    [Pg.337]    [Pg.624]   
See also in sourсe #XX -- [ Pg.553 , Pg.560 , Pg.563 , Pg.565 , Pg.566 , Pg.617 , Pg.631 , Pg.635 , Pg.636 ]



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