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प्रश्न
How will you bring about the following conversion?
Bromomethane to propanone
How will you bring about the following conversion in not more than two steps?
Bromomethane to propanone
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उत्तर १
\[\begin{array}{cc}
\ce{\underset{Bromomethane}{CH3 - Br} ->[Alc{.} KCN][C2H5OH, -H2O, \Delta] \underset{Acetonitrile}{CH3CN} ->[CH3MgBr/ether] [CH3 - C = NMgBr] ->[H^+/H2O][-NH3, -Mg(OH)Br] CH3 - C = O}\\
\phantom{....................................................................................}|\phantom{.........................................................}|\\
\phantom{.........................................................................................}\ce{CH3}\phantom{................................................}\ce{\underset{propanone}{CH3}}\\
\end{array}\]
उत्तर २
\[\begin{array}{cc}
\ce{\underset{Bromomethane}{CH3 - Br} ->[HC = C- Na+][Liq{.} NH3, -NaBr] \underset{Propyne}{CH3 - C ≡ CH} ->[Dil{.} H2SO4][HgSO4] CH3 - C - CH3}\\
\phantom{................................................................................}||\\
\phantom{................................................................................}\ce{\underset{propanone}{O}}\\
\end{array}\]
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संबंधित प्रश्न
Identify A, B, C, D, E, R and R1 in the following:
What happens when bromobenzene is treated with Mg in the presence of dry ether?
Which of the following alkyl halides is used as a methylating agent?
Which one of the following produces acyl halide by treatment with PCl5?
Which of the following statements are correct about the reaction intermediate?
(i) Intermediate (c) is unstable because in this carbon is attached to 5 atoms.
(ii) Intermediate (c) is unstable because carbon atom is sp2 hybridised.
(iii) Intermediate (c) is stable because carbon atom is sp2 hybridised.
(iv) Intermediate (c) is less stable than the reactant (b).
Draw other resonance structures related to the following structure and find out whether the functional group present in the molecule is ortho, para directing or meta directing.
Why is it necessary to avoid even traces of moisture during the use of a Grignard reagent?
Reaction of Grignard reagent with aromatic aldehyde and subsequent aqueous treatment produces
Which of the statements about Grignard reagent is false?
A product (1) of above reaction is:-
Grignard reagent shows addition on
The product formed in the first step of the reaction
\[\begin{array}{cc}
\ce{Br}\phantom{......}\\
|\phantom{.......}\\
\ce{CH3-CH2-CH-CH2-CH-CH3}\\
\phantom{...............}|\\
\phantom{................}\ce{Br}
\end{array}\]
with excess Mg/Et2O(Et = C2H5) is:
Explain why Grignard reagents should be prepared under anhydrous conditions?
Explain why Grignard reagents should be prepared under anhydrous conditions?
Explain why Grignard reagents should be prepared under anhydrous conditions?
Explain why Grignard reagents should be prepared under anhydrous conditions?
Explain why Grignard reagents should be prepared under anhydrous conditions?
