Carbocations

Tropylium tetrafluoroborate

Tropylium tetrafluoroborate is an organic compound with the formula C7H7BF4. Containing the tropylium cation and the non-coordinating tetrafluoroborate counteranion, tropylium tetrafluoroborate is a rare example of a readily isolable carbocation. It is a white solid. This compound may be prepared by the reaction of cycloheptatriene with phosphorus pentachloride, followed by tetrafluoroboric acid. (Wikipedia).

Tropylium tetrafluoroborate
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Related pages

Carbocation | Tropylium cation | Tetrafluoroborate