Light off by syringe. After that, 2.5 mL solution was transferred from the vial into the cuvette by syringe, the solution in the cuvette was bubbled with N2 for 5 minutes. The sample was irradiated with a calibrated 451 nm LED light source for 268.0 mins. After irradiation, the yield of the formed product 26b was determined by GC analysis to be 8.8 %. The quantum yield (Ф) was calculated to be 1.4%