Simple oxidation reaction is one of the most common reaction in industry and academic laboratory and is one of the most polluting and costly. Most oxidation reactions require the use of heavy metal or organic oxidant in stoichiometric amount under harsh condition. Thus, it is of broad academic and industrial interest to develop a more sustainable alternative to conventional oxidation reaction using the principles of green chemistry. Therefore, our research group has been engaged in developing novel 1) photocatalytic method and 2) electrosynthesis to replace the conventional oxidation process.