Optimum Synthesis of Myrtenal from α-Pinene by Photosensitized Oxidation Using Orthogonal Design

Synthesis of myrtenal from a-pinene by photosensitized oxidation in the self-made photochemical reactor was carried out using the halogen lamp as the light source. The effect of photosensitized oxidation reaction variables on the conversion and selectivity of the reactions was evaluated by the orthogonal experimental design of L-9(3(4)).Gas chromatography analysis showed that 94.55% conversion of the materials and 56.16% selectivity of the product were obtained when pyridine-acetic anhydride - copper salt mixture as a catalyst was used for the reaction at 45 degrees C under 0.45 L/min oxygen rate, 0.378 mol/L catalyst concentration and 0.5 mol/L material concentration. Microstructures of myrtenal were characterized using Gas chromatography-mass spectroscopy (GC-MS) and Fourier transform infrared spectroscopy (FTIR).