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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: J Am Chem Soc. 2006 Mar 22;128(11):3543–3553. doi: 10.1021/ja0525859

Figure 2.

Figure 2

S-cis- and s-trans-(E)-crotonaldehyde conformers and calculated transition structures for Diels-Alder reactions with cyclopentadiene. Relevant distances are in Å. Relative energies for the gas phase and activation energies (kcal/mol) are shown.