Introduction Formula R-O-R'where R and R'are alkyl or aryl. Symmetrical or unsymmetrical 。Examples: CH3-O-CH3 )-CH3 => Chapter 14 2Chapter 14 2 Introduction • Formula R-O-R where R and R are alkyl or aryl. • Symmetrical or unsymmetrical • Examples: O CH3 CH3 O CH3 O =>