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Six-Membered Rings with Two Heteroatoms

Nevertheless, we can interpret the reactions of furan and thiophene by logical consideration as we did for pyrrole. In electrophilic substitutions, there is again a preference for 2- rather than 3-substitution, and typical electrophilic reactions carried out under acidic conditions are difficult to control. However, because of lower reactivity compared with pyrrole, it is possible to exploit Friedel-Crafts acylations, though using less-reactive anhydrides rather than [Pg.427]

Other six-membered rings with two heteroatoms are also obtained from reaction of diketene with imidates, cyanamides, carbodiimides, isocyanates, oxa2olines, or other multiftmctional compounds. [Pg.478]

See other pages where Six-Membered Rings with Two Heteroatoms is mentioned: [Pg.39]    [Pg.72]    [Pg.427]    [Pg.427]    [Pg.429]    [Pg.431]    [Pg.269]    [Pg.269]    [Pg.269]    [Pg.288]    [Pg.298]    [Pg.313]    [Pg.432]    [Pg.4]    [Pg.269]    [Pg.269]    [Pg.269]    [Pg.288]    [Pg.298]    [Pg.313]    [Pg.1073]    [Pg.875]    [Pg.877]    [Pg.42]    [Pg.75]   


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Heteroatomic Rings

Rings six-member

Saturated Six-Membered Rings with Two Heteroatoms

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