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. Author manuscript; available in PMC: 2013 Jun 1.
Published in final edited form as: J Org Chem. 2012 May 11;77(11):4939–4948. doi: 10.1021/jo300314z

Figure 4.

Figure 4

Optimized geometries of conrotatory (left) and non-pericyclic (right) ring opening of cyclobutene alkoxide 5a. B3LYP/6-31G(d) selected bond distances (Å) and dihedral angles, with B3LYP/6-311++G(d,p) in parentheses, are shown.