We know that methyl ketones and secondary alcohols oxidizable to methyl ketones, such as isopropanol. The only primary alcohol and aldehyde to undergo this reaction are ethanol and acetaldehyde, respectively. 1,3-Diketones such as acetylacetone also give the haloform reaction. Do Terminal Alkynes give Haloform Reaction if Yes then how the mechanism will follow?

  • $\begingroup$ Maybe if you react with H2SO4/HgSO4 to make an aldehyde beforehand. I don't think a plain terminal alkyne will give the haloform test. $\endgroup$ Jun 9 '20 at 14:56
  • $\begingroup$ And if it is attached to some aromatic ring ? $\endgroup$ Jun 9 '20 at 14:58
  • $\begingroup$ You should read this: chemistry.stackexchange.com/questions/135626/… $\endgroup$
    – user55119
    Jun 25 '20 at 22:36

Terminal alkynes, including phenyl acetylene, react with iodine (in MeOH) to give 1,2-diiodoalkenes according to this JOC paper here. Presence or absence of base will not alter the outcome. Presence of AgNO3 gives some di-iodo ketone which can then give rise to the iodoform reaction.


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