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. Author manuscript; available in PMC: 2021 Jul 20.
Published in final edited form as: Tetrahedron. 2021 Apr 24;91:132160. doi: 10.1016/j.tet.2021.132160

Fig. 3.

Fig. 3.

Distortion/interaction–activation strain analysis for the Diels–Alder reactions of ethylene with cyclopentadiene and 5,5-dimethylcyclopentadiene (A), and 2,3-diazacyclopentadiene and 5,5-dimethyl-2,3-diazacyclopentadiene (B). The analysis was carried out along the intrinsic reaction coordinate (IRC) defined by the average distance of the forming bonds in Ångstroms. (Solid lines: Electronic energies; Short dashed lines: Distortion energies; Long dashed lines: Interaction energies).