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Beilstein J. Org. Chem. 2013, 9, 1873–1880, doi:10.3762/bjoc.9.219
Graphical Abstract
Figure 1: Structures of cations I and precursors II.
Figure 2: Structures of triazinium cations 1–3.
Scheme 1: Synthesis of triazinium cations 1. Reagents and conditions: i) hν (halogen lamp or sunlight), Ca2+,...
Figure 3: Electronic absorption spectra for 1c and 4c (MeCN). Blue lines represent magnified areas of the spe...
Figure 4: Strcutures of trans azo derivatives 5-E and 6-E.
Scheme 2: Synthesis of azo precursors. Reagents and conditions: i) AcOH cat, CH2Cl2, rt, 25 h; ii) toluene, 5...
Scheme 3: Formation of cations 1 from diazenes 4.
Figure 5: B3LYP/6-311G(2d,p)-optimized geometries for structures involved in cyclization of 4c to 1c.
Figure 6: Structures of three close analogues.