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. Author manuscript; available in PMC: 2019 Apr 17.
Published in final edited form as: J Org Chem. 2018 Nov 19;83(23):14658–14666. doi: 10.1021/acs.joc.8b02537

Figure 1.

Figure 1.

Transition state structures with forming bond lengths reported in Å and activation free energies (ΔG⧧) in kcal/mol for the syn and anti Diels–Alder reactions of the 5-substituted cyclopentadienes with ethylene.