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Carbonium ions ureas

The N-methylol urea formed is stabilized by intramolecular hydrogen bonding. In base-catalyzed reactions, the reaction ceases at the methylol urea stage. But the N-methylol compound converts readily into a resonance-stabilized carbonium/immonium ion under the influence of acids ... [Pg.487]

Resonance-stabilized a-ureidoalkyl-(carbonium-immonium) ions then react with suitable nucleophilic reaction partners by electrophilic substitution reactions. Since urea itself, as an acidic NH compound, can be the partner in such a reaction, a chain extension is obtained according to... [Pg.487]

See other pages where Carbonium ions ureas is mentioned: [Pg.448]    [Pg.994]    [Pg.280]    [Pg.395]    [Pg.994]    [Pg.231]    [Pg.122]    [Pg.219]   
See also in sourсe #XX -- [ Pg.26 , Pg.329 ]



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