Abstract
Various phenolic compounds and polyphenols were produced using ultrasonication in the hydroxylation reaction. In the aqueous solution, ultrasonication was useful for producing hydroxyl radical from water. Hydroxylation was also known in the production via epoxy compound. In the method via epoxy compounds high pressure or strong acidic conditions are necessary. Various monophenols substituted with alkyl and methoxy groups were reacted with hydroxyl radicals producing under ultrasonic irradiation(Sus-4005C, 50W, 40kHz and Kaijo, 200kHz) for 12-24h to give the corresponding polyphenolic compounds. When no irradiation of ultrasound was done in this reaction, no reaction was found. The effect of irradiation of ultrasound accelerated the hydroxylation of phenolic compounds. In the case of using cupric acetate in acetic acid, acetoxylation was also accelerated under ultrasonication. [chemical formula][chemical formula][chemical formula]
