“…Die Dioxoverbindung lässt in ihren Eigenschaften eine gewisse Verwandtschaft zu 5,15-Dioxo-5,15-dihydroporphyrin (als Octaethylderivat) erkennen. [15] Die (m, 20 H, H13a,b,16a,b,32a,b,35a,b), 3.06/3.00/1.43 (m, 20 H, H-3a,b,7a,b,22a,b, 26a,b), 2.63/2.56/1.23 (m, 20 H, H-2a,b,8a,b,21a,b, 27a,b), 2.45/ 1.08 ppm (m, 20 H, H-12a,b,17a,b,31a,b,36a,b 68, 150.38, 148.62, 141.91, 141.66, 140.81, 139.39, 137.80, 135.67, 117.68, 19.30, 18.16, 18.10, 17.74, 17.54, 16.95, 15.86, 15.36 07, 162.29, 147.01, 144.30, 143.78, 141.57, 138.38, 137.97, 136.09, 121.22, 21.16, 19.67, 18.24, 17.88, 17.76, 16.64, 16.09, 15.67 (7.13), N 9.37 (9.44). 41, 147.46, 142.49, 142.05, 139.76, 134.27, 130.38, 130.19, 117.30, 51.33 (C-10), 18.99, 18.91, 18.13, 17.89, 17.55, 17.47, 17.29, 14.10 (m, 20 H, H-13a,b,16a,b,32a,b,35a,b), 2.79/1.32 (m, 20 H, H3a,b,7a,b,22a,b,26a,b), 2.73/1.28 (m, 20 H, H-2a,b,8a,b,21a,b,27a,b), 2.25/0.89 ppm (m, 20 H, H-12a,b,17a,b,31a,b,36a,b); (17,300 MHz,[D 8 16,142.88,142.00,141.06,139.96,139.69,138.57,134.03,102.05,101.51,19.46,18.73,18.67,18.34,17.06,17.06,16.64,15.20 ppm;(17,75.5 MHz,[D 8 ]Toluol, 298 K): d = 160.…”