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Tropylium tetrafluoroborate is an organic compound containing the tropylium cation and the non-coordinating tetrafluoroborate counteranion. It is a stable salt which is commercially available.
This compound may be prepared by the reaction of cycloheptatriene with phosphorus trichloride, followed by tetrafluoroboric acid.
References
Tropylium tetrafluoroborate Wikipedia(Text) CC BY-SA