(6)If the hydroxyl group is only a minor part of the structure,it may be named as a hydroxy-substituent. CH,CH,OH OH 0 3 HO H CH一CH一CH2一C一OH trans-3-(2-hydroxyethyl)cyclopentanol 3-hydroxybutanoic acid Nomenclature of Diols (Gycols) Diols are compounds with two hydroxyl groups. They are named as for alcohols except the suffix-diol is used,and two numbers are required to locate the-OH's. OH OH OH OH CH,一CH一CH,OH OH IUPAC name: propane-1.2-diol I-cyclohexylbutane-1.3-diol trans-cyclopentane-1.2-diol Nomenclature of Phenols A phenol always involves a benzene (type)ring,and often the terms ortho,meta and para(meaning 1,2 disubstituted,1,3 disubstituted and 1,4 disubstituted respectively)are used.These terms are non-IUPAC though. 0 OH OH OH Br CH,CH2 IUPAC name: 2-bromophenol 3-nitrophenol 4-ethylphenol common name: ortho-bromophenol meta-nitrophenol para-ethylphenol Chl0 Alcohols:Struct +synth (landscape) Page 4Ch10 Alcohols; Struct + synth (landscape) Page 4 (6) If the hydroxyl group is only a minor part of the structure, it may be named as a hydroxy- substituent. Nomenclature of Diols (Gycols) Diols are compounds with two hydroxyl groups. They are named as for alcohols except the suffix –diol is used, and two numbers are required to locate the –OH’s. Nomenclature of Phenols A phenol always involves a benzene (type) ring, and often the terms ortho, meta and para (meaning 1,2 disubstituted, 1,3 disubstituted and 1,4 disubstituted respectively) are used. These terms are non-IUPAC though