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The additon reaction of enol or enolate ...

The additon reaction of enol or enolate to the carbonyl function of aldehyde or ketone is known as aldol addition . The `beta`-hydroxyaldehyde or `beta-`hydroxyketone so obtained undergo dehydration in second step to produce a conjugated enone. The first part of reaction is an addition reaction and the second part is an elimination reaction. Carbonyl compound having `alpha`-hydrogen undergoes aldol condensation reaction .
`2CH_(3)CH_(2)-overset(O)overset(||)C-Hunderset(Delta)overset(""^(Ө)OH)rarrCH_(3)CH_(2)CH=underset(CH_(3))underset(|)C-overset(O)overset(||)C-H`

Find out product of following reaction :

X is :

A

`CH_(3)-CH=CH-overset(O)overset(||)C-Ph`

B

C

`Ph-overset(O)overset(||)C-CH=underset(Ph)underset(|)C-CH_(3)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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CH_(3)-underset(CH_(3))underset(|)(CH)-CH=CH-CH_(2)-overset(O)overset(||)(C)-OH

Acid-catalyzed mechanism of given aldol reaction. 2CH_(3)-overset(O)overset(||)C-CH_(3) overset(HCl) to CH_(3)-overset(O)overset(|)C-CH=overset(CH_(3))overset(|)C-CH_(3)+H_(2)O

Knowledge Check

  • The additon reaction of enol or enolate to the carbonyl function of aldehyde or ketone is known as aldol addition . The beta -hydroxyaldehyde or beta- hydroxyketone so obtained undergo dehydration in second step to produce a conjugated enone. The first part of reaction is an addition reaction and the second part is an elimination reaction. Carbonyl compound having alpha -hydrogen undergoes aldol condensation reaction . 2CH_(3)CH_(2)-overset(O)overset(||)C-Hunderset(Delta)overset(""^(Ө)OH)rarrCH_(3)CH_(2)CH=underset(CH_(3))underset(|)C-overset(O)overset(||)C-H Find out major product of following reaction :

    A
    B
    C
    D

  • The additon reaction of enol or enolate to the carbonyl function of aldehyde or ketone is known as aldol addition . The beta -hydroxyaldehyde or beta- hydroxyketone so obtained undergo dehydration in second step to produce a conjugated enone. The first part of reaction is an addition reaction and the second part is an elimination reaction. Carbonyl compound having alpha -hydrogen undergoes aldol condensation reaction . 2CH_(3)CH_(2)-overset(O)overset(||)C-Hunderset(Delta)overset(""^(Ө)OH)rarrCH_(3)CH_(2)CH=underset(CH_(3))underset(|)C-overset(O)overset(||)C-H Which of the following will give aldol condensation ?

    A
    B
    `H-overset(O)overset(||)(C)-H`
    C
    D

  • The reaction, CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-ON a+CH_(3)CH_(2)Cl to CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-O-CH_(2)CH_(3) is called

    A
    Etard reaction
    B
    Gattermann-Kock reaction
    C
    Williamson synthesis
    D
    Williamson continuous etherification process

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    The reaction CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C )-ONa+CH_(3)CH_(2)ClrarrCH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C )-O-CH_(2)-CH_(3) is called

    The reaction CH_3-underset(CH_3)underset(|)overset(CH_3)overset(|)C-ONa+CH_3CH_2Clunderset(-NaCl)rarrCH_3-underset(CH_3)underset(|)overset(CH_3)overset(|)C-O-CH_2-CH_3 is called

    The reaction, Ph-CH_(2)-CH=CH-overset(OH)overset(|)(CH)-CH_(3) underset("ketone(excess)"//Delta)overset(Al(BuO)_(3))rarrPhCH_(3)CH=CH-overset(O)overset(||)(C)-CH_(3) is known as :

    In the reaction sequence CH_(3)-overset(O)overset(||)(C)-H-underset(.^(Θ)OH)overset(HCN)rarr(A) underset(Delta)overset(H_(2)O //overset(o+)(H))rarr Product is/are :

    The give reaction H-underset(CH_3)underset(|)overset(CH_2-CH_3)overset(|)(C )-Br " "overset(Theta)overset(OH)(rarr)HO-underset(CH_3)underset(|)overset(CH_2-CH_3)overset(|)(C )-H Is an example of

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