Upload
lekiet
View
218
Download
5
Embed Size (px)
Citation preview
Chem 343 – Organic Reactions Chapter 14
Prepared by José Laboy, MS http://www.chem.wisc.edu/areas/clc (Resource page)
Synthesis and Reactions of Alkynes #7: Hydration of alkynes Mechanism
A terminal alkyne will form a methyl ketone with this process. An internal alkyne can potentially form 2 isomeric ketones. In the case of acetylene the product of hydration is acetaldehyde.
H3C C CH
Hg2+
H3C
Hg2+
H2O
Hg+
HO
H3C
H
H
H2O
HO
H3C H
H
enol form
H3C CH3
O
keto form
H3C C CHHgSO4 / H2SO4
H3CC
CH3
O
HC CHHgSO4 / H2SO4
H3CC
H
O
acetylene acetaldehyde
Hg+
HO
H3C
HHO
H3C Hg+
H
H
HO
HH