Objective The reaction of erythromycin A oxime(EAO)2',4''-hydroxyl and 9-oxime hydroxyl silicon etherifi cation was studied.To explore the effects of multiple silicon hydroxyl etherifi cation reaction and the effects of the separate andone-potsilicon etherification reaction and to reveal the reactionproperties of EAO hydroxyl silicon etherifi cation.Methods 2',4''-hydroxyl and 9-oxime hydroxyl of EAO were reacted with HMDS and tertbutyl methyl chlorosilane or triphenyl silicon chloride,respectively.Impacts ...