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. Author manuscript; available in PMC: 2008 Sep 1.
Published in final edited form as: J Am Chem Soc. 2007 May 27;129(24):7638–7646. doi: 10.1021/ja070818l

Figure 7.

Figure 7

0.05 au ACID isosurface for the transition state involved in the concerted loss of N2 C-4a and for model Diels–Alder reactions. Plot of the Nucleus Independent Chemical Shift (NICS) for relevant transition states related with the N2 extrusion.