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. Author manuscript; available in PMC: 2020 May 22.

Published in final edited form as: J Org Chem. 2012 Nov 20;77(23):10804–10810. doi: 10.1021/jo3020837

Figure 1. — A) Molecular structure and numbering schemes for the crystals of Z-4 (displacement ellipsoids are at the 50% level). B) 1D ¹H NMR spectra of recrystallized Z-4 in CDCl₃ at −20 °C indicating Z-4 and E-4 isomers to exist in 66:1 ratio in solution phase.

Figure 1. — A) Molecular structure and numbering schemes for the crystals of Z-4 (displacement ellipsoids are at the 50% level). B) 1D ¹H NMR spectra of recrystallized Z-4 in CDCl₃ at −20 °C indicating Z-4 and E-4 isomers to exist in 66:1 ratio in solution phase.