? asked in 科學化學 · 1 decade ago

請問有關有機化學dehydrayion reaction?

請問下面兩道題目,如何解題以及如何區分major product及minor product??

(1)What products would you expect from the following dehydration reaction? Which product will be major, and which minor?

3-methyl-2-butanol

(2)What alcohol(s) would yield 4-methyl-2-hexene on dehydration?

上課聽不懂老師說的= =麻煩化學高手們幫幫忙了...

1 Answer

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  • Yy
    Lv 7
    1 decade ago
    Favorite Answer

    (1)What products would you expect from the following dehydration reaction? Which product will be major, and which minor?

    3-methyl-2-butanol

    圖片參考:http://www.hamm-chemie.de/images/j11/strukturforme...

    (CH3)2CHCHOHCH3 脫水

    MAJOR PRODUCT:

    (CH3)2C=CHCH3

    Minor product:

    (CH3)2CHCH=CH2

    依據 Zaitsev rule (C=C上)愈多取代的alkene愈穩定 產物愈多

    (2)What alcohol(s) would yield 4-methyl-2-hexene on dehydration?

    什麼醇脫水可得 4-methyl-2-hexene:

    CH3CH2CH (CH3)CH=CHCH3

    在C=C上加入H-OH便成 因此有兩個可能

    (i) CH3CH2CH (CH3)CH2CHOHCH3

    (ii) CH3CH2CH (CH3)CHOHCH2CH3

    答案是(i) CH3CH2CH (CH3)CH2CHOHCH3

    因為(ii) CH3CH2CH (CH3)CHOHCH2CH3脫水後得到的主要ALKENE

    CH3CH2C(CH3)=CHCH2CH3

    愈多取代的alkene愈穩定 產物愈多

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