Reactions of Alkynes (C triple bond C)

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Last updated 9:23 PM on 7/5/26
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10 Terms

1
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Terminal Alkyne

A terminal alkyne has the triple bond at the end of the carbon chain. One of the triple-bonded carbons is attached to a hydrogen.

<p>A <strong>terminal alkyne</strong> has the triple bond at the <strong>end</strong> of the carbon chain. One of the triple-bonded carbons is attached to a <strong>hydrogen</strong>.</p>
2
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Internal Alkyne

an alkyne where the triple bond is in the middle of the carbon chain

<p>an alkyne where the <strong>triple bond is in the middle of the carbon chain</strong></p>
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H2 & Pd/C (Reduction)

Product: After adding Hydrogen twice, you go from an Alkyne to an Alkene, to finally an alkane.

<p>Product: After adding Hydrogen twice, you go from an Alkyne to an Alkene, to finally an alkane. </p>
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H2 / Lindlar’s Catalyst (Reduction)

Product: Cis Alkene

<p>Product: Cis Alkene</p>
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Li or Na/ Liquid NH3 (Reduction)

Product: Trans Alkene

<p>Product: Trans Alkene</p>
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HBr

Product: Triple bond becomes a double bond (Alkene) and H and Br are added.

<p>Product: Triple bond becomes a double bond (Alkene) and H and Br are added.</p>
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H2O (Hydration)

Product: Alkane (Single bond) and a Ketone

<p>Product: Alkane (Single bond) and a Ketone</p>
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BH3, THF & H2O2/OH- with a terminal alkyne

Product: Aldehyde if its a terminal alkyne

<p>Product: <strong>Aldehyde </strong>if its a terminal alkyne</p>
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HgSO4 and H+/ H2O with an internal alkyne

Product: Ketone + methyl if its an internal alkyne (Carbonyl group goes to most substituted Carbon)

<p>Product: Ketone + methyl if its an internal alkyne (Carbonyl group goes to most substituted Carbon)</p>
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NaNH2 / R1 - X

Product: Remove the H, then replace it with R

<p>Product: Remove the H, then replace it with R</p>