Alkyne Reaction help

[Brasarehot]

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What's the difference between H2/NH3 reagent and H2/Lindlar catalyst? Lindlar gives cis alkene, so what does H2/NH3 give?

 

[Baylor2011]

Trans alkene

 

[orgohacks]

What's the difference between H2/NH3 reagent and H2/Lindlar catalyst? Lindlar gives cis alkene, so what does H2/NH3 give?

I think you mean Li/NH3 ? It gives the trans alkene.