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Carbenium-oxonium dication

The dissolution of the adamanantane-2,6-dione in 1 4 SbFs FSO3H/SO2 gave the 2,6-dihydroxy-2,6-adamantanediyl dication (99). This dicarboxonium ion has more oxonium character than the carbenium character as shown by the much shielded absorption for the carbonyl carbon (8 C 247.7), relative to the monocarboxonium ion, 100(8 C 267.1). ... [Pg.238]

The two important resonance structures for the dication are the bis-oxonium structure (73a, a distonic superelectrophile) and the bis-carbenium structure (73b, a gitonic superelectrophile). Although it is understood that various factors should favor structure 73a (including... [Pg.198]

Although no mechanism is proposed for the dimerization of lactic acid in the FSOsH-SbFs solution, the process may very well involve the superelectrophile 147. Other oxonium-carbenium 1,3-dications have been suggested in superacid promoted pinacolone rearrangments of diprotonated aliphatic glycols and alkoxy alcohols (eqs 49-50).58... [Pg.213]

See other pages where Carbenium-oxonium dication is mentioned: [Pg.598]    [Pg.134]    [Pg.598]    [Pg.134]    [Pg.256]    [Pg.187]    [Pg.193]    [Pg.214]   
See also in sourсe #XX -- [ Pg.598 , Pg.599 ]



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1.3- Carbenium-oxonium dications

Carbenium

Dication

Dications

Oxonium

Oxonium dication

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