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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. 1.

Fig. 1.

M06-2X/6-31+G(d)-optimized ground state structures of (left to right) cyclopentadiene, 5,5-dimethylcyclopentadiene, 2,3-diazacyclopentadiene, and 5,5-dimethyl-2,3-diazacyclopentadiene.