Advertisements
Advertisements
प्रश्न
Explain the following reactions:
Stephan reaction
Advertisements
उत्तर
This reaction is used to synthesize aldehydes from nitriles or cyanides. Firstly, nitriles or cyanides are reduced in presence of stannous chloride and hydrochloric acid in ethyl acetate solvent to form imine intermediate. Then hydrolysis of this intermediate with water gives the corresponding aldehyde.
\[\ce{CH3 - C ≡ N + 2[H] ->[SnCl2/HCl][Ether] CH3 - CH = NH + HCl ->[H2O/H^+] \underset{Acetaldehyde}{CH3CHO} + NH4Cl}\]
APPEARS IN
संबंधित प्रश्न
How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.
p-Nitrobenzaldehyde
Aldehydes are prepared by reducing nitriles to corresponding imines with stannous chloride in the presence of hydrochloric acid. This reaction is called:
Name the electrophile produced in the reaction of benzene with benzoyl chloride in the presence of anhydrous \[\ce{AlCl3}\]. Name the reaction also.
Ethylbenzene is generally prepared by acetylation of benzene followed by reduction and not by direct alkylation. Think of a possible reason.
In the chromyl chloride test, the final step results in the formation of a yellow precipitate of the following:
\[\begin{array}{cc}
\ce{CH3 - CH2 - CH - CH3}\\
\phantom{.....}|\\
\phantom{......}\ce{Cl}
\end{array}\] obtained by chlorination of n-butane, will be
The number of chiral carbon in glucose is:-
The general formula CnH2NO2 could be for open chain
Aldehydes are the first oxidation products of ______.
Reagent used to convert allyl alcohol to acrolein is ______.
