Diels Alder - Why HOMO and LUMO?

  • #1
149
1

Main Question or Discussion Point

In diels alder reactions, why does the reaction always occur between the HOMO of the diene, and the LUMO of the dienophile? Well, what I'm really trying to figure out is how to determine which reactant donates the electrons, and which reactant receives them in cycloadditions.
 

Answers and Replies

  • #2
DrDu
Science Advisor
6,032
759
In the course of the reaction, the bond in the dienophile is broken, so it's LUMO has somehow to be populated. The other possibility, depopulation of the HOMO, would not leave electrons at all on the dienophile to form the new bonds.
 

Related Threads on Diels Alder - Why HOMO and LUMO?

  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
4K
Replies
3
Views
2K
Replies
1
Views
7K
Replies
3
Views
2K
Replies
0
Views
2K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
6
Views
880
  • Last Post
Replies
1
Views
1K
Top