When brominating trans-stilbene with pyridinium tribromide, acetic acid is required. What purpose does acetic acid serve in the reaction? Shouldn't the tribromide be sufficient?

  • $\begingroup$ Dah... How are you going to get two solids to react? $\endgroup$ – MaxW Apr 21 at 19:18
  • $\begingroup$ If the solids have some vapor pressure they could contact each other through vaporization. $\endgroup$ – Oscar Lanzi Apr 21 at 20:55

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