CHEM 282 Lecture : Clarify ENDO and EXO.pdf

• School: Simon Fraser University
• Department: Chemistry
• Course: CHEM 282
• Professor: Robert Britton

Document Summary

The diels-alder reaction can proceed via an endo or exo transition structure. When there is a double bond ( bond) attached to the dieneophile the endo transition structure is favored. Och3 dieneophiles with group dieneophiles without group. If the dieneophile has a group then consider the two possible orientations of the dieneophile in the transition structure. In one arrangement the group is underneath the diene and this is termed the endo transition structure and consequently gives rise to the endo product. In arrangement b, the group is pointed away (not underneath) the diene and this is termed an exo transition structure and consequently gives rise to the. While the exo transition structure has less steric interactions, the endo. Interaction between the group and the p-orbitals on the. When a group is attached to the dieneophile. To predicting the correct stereochemistry of the endo. Look at the s-cis conformation of the diene.