Unusual Onium Cations
- Borenium cations, R2B+ (protonated borylenes)
- Carbenium cations, R3C+ (protonated carbenes)
- Methenium cation, H3C+ (protonated methylene)
- Silylium cations, R3Si+ (protonated silylenes)
- Nitrenium cations, R2N+ (protonated nitrenes)
- Mercurinium cations, R3Hg+ (protonated organomercury compounds; formed as intermediates in oxymercuration reactions)
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