Naming Carboxylic Acid Derivatives Thioesters,RCOSR' Thioesters are named like the corresponding esters If ester has common name the prefix thio-is used If ester has a systematic name the-oate or-carboxylate ending is replaced by-thioate or -carbothioate 0 SCH3 H3C SCH3 CH3CH2CH2 C-SCH2CH3 Methyl thioacetate Ethyl butanethioate Methyl cyclohexane- carbothioateThioesters, RCOSR′ ▪ Thioesters are named like the corresponding esters ▪ If ester has common name the prefix thio- is used ▪ If ester has a systematic name the –oate or –carboxylate ending is replaced by –thioate or -carbothioate Naming Carboxylic Acid Derivatives