Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Most stable calculated transition structures for the Diels-Alder reaction of cyclopentadiene with 4-hexen-3-one catalyzed by chiral imidazolidinone 5. Relevant distances are in Å. Relative energies for the gas phase (or water, in brackets) and activation energies (kcal/mol) are shown.
