Advertisements
Advertisements
प्रश्न
How ketones are prepared from nitriles?
Advertisements
उत्तर
Ketones are made by reacting nitriles with Grignard reagent in dry ether as a solvent, then acid hydrolyzing them.
\[\begin{array}{cc}
\phantom{}\ce{\underset{(Ehtanenitrile)}{H3C - C ≡ N} + H3CMgCl ->[dry ether] CH3 - \underset{|}{C} = NMgCl ->[H3O^⊕] \underset{(Acetone)}{CH3 - CO - CH3} + NH3 + Mg(Cl)OH}\\
\ce{H3C}\phantom{................}
\end{array}\]
\[\begin{array}{cc}
\phantom{}\ce{ \underset{(Benzonitrile)}{C6H5 - C ≡ N} + C6H5 - MgBr ->[dry ether] C6H5 - \underset{|}{C} = NMgBr ->[H3O^⊕] \underset{(Benzophenone)}{C6H5 - CO - C6H5} + NH3 + Mg(Br)OH}\\
\ce{C6H5}\phantom{.......}
\end{array}\]
APPEARS IN
संबंधित प्रश्न
Write the structures of A and B in the following reactions:
Complete the synthesis by giving missing starting material, reagent or product.
Complete the synthesis by giving missing starting material, reagent or product.
Write a note on ‘aldol condensation’.
Write chemical equation for the following :
Rosenmund reduction
Answer the following in one sentence.
Name the product obtained by reacting toluene with carbon monoxide and hydrogen chloride in presence of anhydrous aluminium chloride.
What is the action of following reagents on ethanoic acid?
SOCl2/heat
What is the action of following reagents on ethanoic acid?
sodalime/heat
What is the action of following reagents on ethanoic acid?
P2O5/heat
An acylchloride is hydrogenated over catalyst palladium on barium sulphate to form an aldehyde. This reaction is called as ______.
Rosenmund reduction of ____________ yields benzaldehyde.
Identify the compound obtained by side chain chlorination of toluene and hydrolysed further.
Identify the compound A and Bin following reaction.
\[\ce{CH3Cl ->[KCN(alc)][\Delta] A ->[2H2O][HCl] B + NH4Cl}\]
Identify 'A' in the following reaction:
\[\begin{array}{cc}
\phantom{...........}\ce{O}\\
\phantom{...........}||\\
\ce{2A + (C6H5CH2)2 Cd -> 2CH3 - C - CH2 - C6H5 + CdCl2}\end{array}\]
What is the final product obtained when benzonitrile react with phenyl magnesium bromide in equimolar proportion?
Identify 'A' in the following reaction.
\[\ce{A ->[H2][Pd-BaSO4] C6H5CHO + HCl}\]
Which of the following is obtained by hydrogenation of benzoyl chloride in presence of Pd on BaSO4?
Identify product A in the following reaction:
\[\ce{Acetyl chloride + Dibenzylcadmium -> A}\]
The reaction
Write Stephen reaction for the preparation of aldehyde.
How butanone is prepared from alcohol?
How are the following compound obtained by hydration of alkenes?
tert-butyl alcohol
Write the name of the product formed when ethanoyl chloride is treated with dimethyl cadmium.
Which of the following on heating with aqueous KOH produces acetaldehyde.
Identify substrate ‘A’ in the following conversion:
\[\ce{A \underset{dry ether}{\overset{CH3MgCl}{->}} complex \overset{H3O+}{->} acetone}\]
Identify the reagent ‘R’ necessary to bring the following conversion.
