Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Silver assisted ring-opening reactions

Under these conditions, silver-assisted electrocyclic ring opening provided the haloallyl cation, which was subsequently trapped by isocyanate anion. Interception of the cationic species with isocyanate was successful since bromide was removed from the reaction mixture as a precipitate (AgBr). Finally, treatment of intermediate 9 with methanol furnished the desired carbamate in 96% yield. This example demonstrates the usefulness of the silver(I)-mediated process. Removal of free halide from the reaction mixture affords a long-lived cationic species that can be captured by a different nucleophile, such as solvent, the silver(I) counteranion, or an intramolecular nucleophile. This reactivity has been exploited in many different ways throughout the years and is examined in greater detail later in this chapter. [Pg.121]


See other pages where Silver assisted ring-opening reactions is mentioned: [Pg.531]    [Pg.531]    [Pg.117]    [Pg.120]    [Pg.118]    [Pg.119]    [Pg.124]    [Pg.137]    [Pg.139]    [Pg.894]    [Pg.894]    [Pg.276]    [Pg.553]    [Pg.553]   
See also in sourсe #XX -- [ Pg.120 ]




SEARCH



Assisted reactions

Ring opening reactions

Silver-assisted

© 2024 chempedia.info