 With epoxides and aziridines the reaction serves as a ring @-@ expansion to produce the corresponding oxetane or azetidine . The long reaction times required for these reactions prevent them from occurring as significant side reactions when synthesizing epoxides and aziridines . 
 With epoxides and aziridines the reaction <a href='uninflect' title='1'><mark>serves</mark></a> as a ring @-@ expansion to produce the corresponding oxetane or azetidine . The long reaction times required for these reactions prevent them from occurring as significant side reactions when synthesizing epoxides and aziridines . 
With epoxides and aziridines da reaction serve as a ring @-@ expansion to produce the corresponding oxetane or azetidine . Tdalong reaction times required fir dem reactions prevent em from occurring as significant side reactions when synthesizing epoxides and aziridines .