1: SOCl2, pyridine / 4 h / 90 °C 2: 1) n-BuLi / 1) THF, hexane, -78 deg C, 1h, 2) RT, 8h 3: 35 percent / O2, Rose Bengal / CH2Cl2 / 2 h / -78 °C / Irradiation 4: xylene / 97 °C / ΔH(excit.), ΔS(excit.), ΔG(excit.), other temp., chemiluminescence technique (DBA) View Scheme

thionyl chloride in pyridine T=120 - 130°C; 6 h;

sulfuric acid in acetic acid 0.0166667 h; Heating;

pyridine; thionyl chloride T=90°C; 4 h;