Why is halogenation of ketones in base described as being "base-promoted" and not "base-catalysed"?

If the reaction is not "catalyzed" then how is the base used up?

  • $\begingroup$ For example, the base used in idoform reaction did not get regenerated. Therefore, it is needed as a reactant, not as a catalyst. Thus, it is a "base promoted" reaction, not "base catalysed." $\endgroup$ – Mathew Mahindaratne Jun 28 '19 at 21:54
  • $\begingroup$ en.wikipedia.org/wiki/Ketone_halogenation The second image shows you the mechanism, and why the base is not a catalyst $\endgroup$ – The_Vinz Jun 28 '19 at 23:41
  • $\begingroup$ Does "base-promoted" simply mean that the mechanism requires base? Base-catalyzed means that the base is regenerated during the reaction. The base in the aldol condensation is catalytic. In the Claisen condensation or saponification the base needs to be stoichiometric in that it is consumed during the reaction by deprotonation. IMO both sets of conditions may be considered base-promoted. $\endgroup$ – user55119 Jun 29 '19 at 15:19

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