Cis trans alkenes and reactivity

[ratatat]

I know trans isomers are more stable than cis...But when it comes to addition reactions, is cis or trans more reactive?

Also, what about reactions in general, which one is more reactive?

Thank you.

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[RogueUnicorn]

like any reactions, you can draw yourself an energy diagram. see what you come up with.

 

[ratatat]

To be honest, I have no idea.

 

[wanderer]

The term "reactive" can mean different things. If we are talking about thermodynamics, then the most stable product and least stable reactants are most reactive. If we are talking about kinetics, then the activation energies (difference between transition state and reactant) determine what's more reactive. Things like conformation can make a difference too especially (but not exclusively) when we are dealing with cyclic molecules.

So as far as thermodynamics go cis alkenes should be more reactive (since they are less stable than trans alkenes). As far as kinetics go, you should use Hammond's Postulate to guide you.....

 

[ratatat]

Hey boss, thanks a lot.