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. Author manuscript; available in PMC: 2008 Nov 5.
Published in final edited form as: Tetrahedron. 2007 Nov 5;63(45):11030–11039. doi: 10.1016/j.tet.2007.08.041

Figure 6.

Figure 6

Influence of acid (curve 3: trifluoroacetic acid, neat) and base (curve 2: DBU, 1,8-diazabicylclo[5.4.0]undec-7-ene, neat) on the UV-visible spectra of 1, compared with curve 1: CHCl3 for ∼ 1 × 10-5 M solutions at 23°C.