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. Author manuscript; available in PMC: 2020 Sep 20.
Published in final edited form as: J Org Chem. 2019 Sep 5;84(18):11856–11862. doi: 10.1021/acs.joc.9b01708

Table 3.

Calculated relative energies (kcal/mol) of the C1 and C2 conformations of 6-14 and 22 in the protonated states. The results for the deprotonated states are given in parenthesis.

Ground State Excited Singlet State
C1 C2 C1 C2
6 0.0 (0.0) 5.3 (7.7) 0.0 (0.0) 6.6 (6.7)
7 0.0 (0.0) 4.2 (3.8) 0.0 (0.0) 4.0 (4.6)
8 0.0 (0.0) 3.3 (3.0) 0.0 (0.0) 5.6 (1.8)
9 0.0 (0.0) 6.0 (7.4) 0.0 (0.0) 7.8 (6.9)
10 0.0 (0.0) 4.7 (3.7) 0.0 (0.0) 4.8 (4.6)
11 0.0 (0.0) 3.7 (2.9) 0.0 (0.0) 5.7 (1.8)
12 0.0 (0.0) 6.1 (7.2) 0.0 (0.0) 8.0 (6.8)
13 0.0 (0.0) 4.8 (3.6) 0.0 (0.0) 5.2 (4.4)
14 0.0 (0.0) 3.9 (2.8) 0.0 (0.0) 5.8 (1.9)
22 0.0 (0.0) 0.0 (0.6) 0.0 (0.0) 0.9 (1.4)