Himuro Kari

有關IUPAC命名法的問題

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3-methyl-4-propylheptane

6-ethyl-3,4-dimethyloctane

請問這兩個烷烴為什麼一個是methyl在最前面另一個卻是ethyl在最前面

IUPAC的取代基順序到底是怎麼排的,是以取代基的位置還是大小排順序

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根據支鏈編號最小者排序

也就是說3-methyl-4-propylheptane不能命名為5-methyl-4-propylheptane,因為排序數字較小者為3優先,至於為什麼先寫甲基再寫丙基,因為英文字母排序先m後p

而6-ethyl-3,4-dimethyloctane也不可命名為5-ethyl-7,8-dimethyloctane,因為3優先於5,至於先寫乙基再寫甲基,因為英文字母排序先e後m

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