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Carbocations oxygen ring substituents

Effects of oxygen substitutents in an aromatic ring upon an exocyclic rather than endocyclic carbocation charge center have also been measured. The possibility of comparing HO, MeO, and O substituent effects for the benzylic cations is provided by recent studies of quinone methides, including the unsubstituted / -quinone methide 23, which may be considered as a resonance-stabilized benzylic cation with a /xoxyanion substituent. [Pg.57]

In contrast, cyclic carbonate with an exo-methylene substituent in the ring polymerizes via an SnI mechanism. Such a monomer can undergo ring-opening reaction spontaneously to produce a linear product with allyl cation that will be attacked by the carbonyl oxygen atom of the next monomer molecule according to the SnI mechanism (Scheme 27). It should be noticed that allyl carbocation is stabilized by an electron delocalization. [Pg.260]

See other pages where Carbocations oxygen ring substituents is mentioned: [Pg.137]    [Pg.152]    [Pg.565]    [Pg.565]    [Pg.248]    [Pg.291]    [Pg.657]    [Pg.51]    [Pg.52]    [Pg.59]    [Pg.59]    [Pg.84]    [Pg.84]    [Pg.291]    [Pg.376]    [Pg.264]    [Pg.60]    [Pg.291]    [Pg.110]    [Pg.565]    [Pg.105]    [Pg.1986]    [Pg.91]    [Pg.172]    [Pg.519]    [Pg.379]    [Pg.199]    [Pg.164]    [Pg.657]    [Pg.1296]    [Pg.183]   


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Carbocations substituents

Oxygen ring

Ring oxygenation

Ring substituents

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