Alkyne Reactions

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Last updated 10:08 PM on 4/14/26
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11 Terms

1
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1) LDA

2) XR

  • For Terminal alkynes

  • Adds R where alkyne had removed hydrogen

  • MECHANISM

2
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NaH / NaNH2

  • Removes terminal hydrogen from alkyne

  • Can use ketone after to add alcohol and R group

  • MECHANISM

3
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Lindlars

Same as Ni2B , H2

  • From Alkyne

  • Adds syn Hydrogen

  • Stays double bond

4
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Na(NH3) , H2

  • From Alkyne

  • Adds trans Hydrogens

  • Stays double bond

5
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Br2

  • From Alkyne

  • Adds Br twice onto both carbons

6
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HX

  • From Alkyne

  • Mark addition of two Br

7
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HX , H2O2

  • From Alkyne

  • Antimark addition of two Br

8
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H2O , H2SO4 , HgSO4

  • From Alkyne

  • Mark addition of ketone

  • Creates an enol (Taotomerism)

9
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1) Sia2B-H (or 9BBN)

2) H2O2 , -OH

  • From Alkyne

  • Removes alkyne and adds ketone on one of the carbons

10
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1) O3 , -78o

2) H2O

  • Breaks Alkyne

  • Forms Carboxylic acids

  • Will make CO2 if one side is terminal

11
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KMnO4 , KOH , H2O , Heat , H+ wkup

  • Breaks Alkyne

  • Forms Carboxylic acids

  • Will make CO2 if one side is terminal