Cis to trans

An alkyne is treated with Lindlar Catalyst/H2 to give a cis alkene and then upon treatment with H+ becomes trans, can anyone explain why?

Original post by jacksonmeg

An alkyne is treated with Lindlar Catalyst/H2 to give a cis alkene and then upon treatment with H+ becomes trans, can anyone explain why?

Hydrogenation gives cis as H2 adds from same side. Isomerisation of cis to trans to give thermodynamically more stable double bond isomer.

So misleading haha :laugh:

So misleading haha :laugh:

Tbh, wish people didn't think of "cis and trans" as the tumblr **** at all

Original post by mechanicsonejune

Tbh, wish people didn't think of "cis and trans" as the tumblr **** at all

I didn't know what 'cis' was until a month ago. I'm glad this turned out to be a Chemistry question, and it seems I was late in answering it :tongue:

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