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Tropylium tetrafluoroborate
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<p>Tropylium tetrafluoroborate is an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the formula [C7H7]+[BF4]−. Containing the <a href="/facts/Tropylium_cation/3vAk8fwQ">tropylium cation</a> and the non-coordinating <a href="/facts/Tetrafluoroborate/46EEToo6">tetrafluoroborate</a> counteranion, tropylium tetrafluoroborate is a rare example of a readily isolable <a href="/facts/Carbocation/vIggUxTh">carbocation</a>. It is a white solid. </p><p>This compound may be prepared by the reaction of <a href="/facts/Cycloheptatriene/cd9Ny85g">cycloheptatriene</a> with <a href="/facts/Phosphorus_pentachloride/oGLG4kDg">phosphorus pentachloride</a>, followed by <a href="/facts/Tetrafluoroboric_acid/fGEUfXpQ">tetrafluoroboric acid</a>. </p>