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Topic: Alkyne Reaction Help  (Read 2757 times)

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Offline brasarehot

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Alkyne Reaction Help
« on: June 27, 2010, 10:16:47 AM »
What is the difference between H2/Lindlar catalyst and H2/NH3 reagents? I know H2/Lindlar gives a cis alkene, but what does H2/NH3 do?
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Offline SVXX

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Re: Alkyne Reaction Help
« Reply #1 on: June 27, 2010, 11:01:53 AM »
Na/NH3 hydrogenates in a trans fashion. It is a type of dissolving metal reduction. http://www.chem.ucalgary.ca/courses/351/Carey/Ch09/ch9-7.html for the mechanism.
So your product would be a trans-alkene.
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