2.1.4 Nomenclature (IUPAC Rules) 5. If a compound had two or more chains of the same length, the parent hydrocarbon is the chain with the greatest number of substituents CH3CH2CHCH2CH2CH3 CH3 CH2 CHCH2 CH2CH3 CHCH3 HCH3 CH H 3-ethyl-2-methylhexane not 3-isopropylhexane (two substituents) (one substituent)
2.1.4 Nomenclature (IUPAC Rules) ◼ 5. If a compound had two or more chains of the same length, the parent hydrocarbon is the chain with the greatest number of substituents. ◼ CH3CH2CHCH2CH2CH3 CH3CH2CHCH2CH2CH3 ◼ CHCH3 CHCH3 ◼ CH3 CH3 ◼ 3-ethyl-2-methylhexane not 3-isopropylhexane ◼ (two substituents) (one substituent)
2.1.4 Nomenclature (IUPAC Rules) 6. If there are some complex substituents. we can use the similar method to name the substituents CH3CH2 CHCH2CH2CH3 CH3CH2 CH2CHCH2 CH2CH3 123 CHCH H2 CHCH3 H 3-isopropylhexane or 4-isobutylheptane or 3-(1-methylethyl)hexane 4-(2-methylpropyl)heptane
2.1.4 Nomenclature (IUPAC Rules) ◼ 6. If there are some complex substituents, we can use the similar method to name the substituents. ◼ CH3CH2CHCH2CH2CH3 CH3CH2CH2CHCH2CH2CH3 ◼ 1 2 1 2 3 ◼ CHCH3 CH2CHCH3 ◼ CH3 CH3 ◼ 3-isopropylhexane or 4-isobutylheptane or ◼ 3-(1-methylethyl)hexane 4-(2-methylpropyl)heptane
2.1.4 Nomenclature (IUPAC Rules) 当一个饱和支链无环烃具有相同长度的链可作为 主链时,则选择的顺序为: ■1)具有侧链数目最多的链 4-propyl-2, 3, 5 CH trimethyl heptane CH3 CH2CH-CHCH-CHCH3 not CH3! CH2 CH CH2CH 3-methyl-4(1, 2 dimethylpropylheptane
2.1.4 Nomenclature (IUPAC Rules) ◼ 当一个饱和支链无环烃具有相同长度的链可作为 主链时，则选择的顺序为： ◼ 1）具有侧链数目最多的链 ◼ 4-propyl-2,3,5- ◼ trimethylheptane ◼ not ◼ 3-methyl-4-(1,2- ◼ dimethylpropyl)heptane CH3 CH2 CH CHCH CH3 CH2 CH3 CHCH3 CH3 CH2 CH3
2.1.4 Nomenclature (IUPAC Rules) 2)侧链具有最低位次的链 CH」3CH2CH一 CH CH2-CHCH3 CH3 i CHCH3 CH 3 CHeCH 3 a 2, 5-dimethyl-4-(1 methylpropay l)heptane(not 3, 4, 5)
2.1.4 Nomenclature (IUPAC Rules) ◼ 2）侧链具有最低位次的链 ◼ 2,5-dimethyl-4-(1- methylpropayl)heptane (not 3,4,5) CH CH2 -CHCH3 CHCH3 CH3 CH2 CH CH2 CH3 CH3 CH3
2.1.4 Nomenclature (IUPAC Rules) ■3)在较短的侧链中,具有碳原子数目最多的链 CH2 CH3 CH ChCH CH3CH2CHCH2CHCH2\ CH2 CHCH2CHCH2CH3 CH3 CH2CHCH2CHCH2 CH2CHCH2CHCH2CH3 CH3 CH3 CH2 Ch (各侧链数分别为111288和11189) 3-ethy l-5, 9, 11-trimethyl-7, 7-di(2, 4 dimethy hexyl)tridecane
2.1.4 Nomenclature (IUPAC Rules) ◼ 3）在较短的侧链中，具有碳原子数目最多的链 ◼ （各侧链数分别为111288和111189） ◼ 3-ethyl- 5,9,11-trimethyl-7,7-di(2,4- dimethylhexyl)tridecane C CH2 CHCH2 CHCH2 CH3 CH2 CHCH2 CHCH2 CH3 CH3 CH2 CHCH2 CHCH2 CH3 CH2 CHCH2 CHCH2 CH3 CH3 CH3 CH3 CH3 CH2 CH3 CH3 CH3