Diels-Alder reactions - Does the endo rule always apply


by CrimpJiggler
Tags: apply, dielsalder, endo, reactions, rule
CrimpJiggler
CrimpJiggler is offline
#1
Dec13-13, 03:12 AM
P: 149
So when you have a cyclic diene like cyclopentadiene, you can get either the endo or exo isomer. Secondary orbital interactions make the reaction selective towards the endo isomer. This makes sense if your dieneophile is say maleic anhydride:

in that case the dienophile has C=O bonds which has p orbitals that will overlap with the second pair of p orbiitals on the diene.

But what if your dienophile is something like cyclopentene. In that case, the dienophile has no p oribtals for the dienophile to interact with. In this case, will the exo isomer be the major product?
Phys.Org News Partner Chemistry news on Phys.org
Mantis shrimp stronger than airplanes
MRI sensor that enables long-term monitoring of oxygen levels could aid cancer diagnosis, treatment
The anti-inflammatory factory

Register to reply

Related Discussions
Diels Alder - Why HOMO and LUMO? Chemistry 1
'diels alder' like reaction with nonconjugated dienes Chemistry 3
Diels-Alder Reaction Biology, Chemistry & Other Homework 5
Questions about Diels Alder reaction Biology, Chemistry & Other Homework 1
Diels-alder reaction Chemistry 1