Epoxides These 3 membered rings are named using the term epoxy as a substituent H203H CH, CH-CH,一CH OCH, cis-2.3-epoxy-4-methoxyhexane (cis refers to the substituents,not the epoxide which must be cis/syn). Epoxides have considerable ring strain. Oxetanes These are four membered rings with one oxygen. CH3- 3 2 CH,CH CH H oxetane 2-ethyl-3,3-dimethyloxetane Oxetanes have ring strain,but not as much as epoxides. Chl4 Ethers and Epoxides (landscape).docx Page 4 Ch14 Ethers and Epoxides (landscape).docx Page 4 Epoxides These 3 membered rings are named using the term epoxy as a substituent. (cis refers to the substituents, not the epoxide which must be cis/syn). Epoxides have considerable ring strain. Oxetanes These are four membered rings with one oxygen. Oxetanes have ring strain, but not as much as epoxides