Question
In organic lab you have just synthesized the tropylium ion, $\mathrm{C}_7 \mathrm{H}_7{ }^{+}$, in solution. Tell how you would isolate it from solution to get a stable crystalline solid.
Step 1
Since the tropylium ion is a cation, you can add a suitable anion source, such as sodium chloride (NaCl) or potassium bromide (KBr), to the solution. This will help to form a stable salt, such as tropylium chloride or tropylium bromide, which is more amenable to Show more…
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In the synthesis of the pyrylium ion, the penultimate product is a $4 H$ -pyran. Draw the structure of $4 \mathrm{H}$ -pyran and give the conditions under which it can be converted to the pyrylium ion.
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