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KISHORE K Grade: 12
        

sir plz give me the explanation about stephen's reaction

7 years ago

Answers : (4)

askIITianExpert_ Sukumar_ IITKharagpur
askIITians Faculty
34 Points
										

Stephen's reaction or Stephen Aldehyde Synthesis:


The Stephen's reaction is used to prepare aldehydes from nitriles or cyanides. The reduction of nitriles with stannous chloride and hydrogen chloride in ethyl acetate solvent produces imine intermediate. The hydrolysis of this intermediate with water gives the corresponding aldehyde.


 


           SnCl2                                            H2O


R-CN -----------------> [R-CH=NH2+ ][Cl-] ---------> R-CHO


            HCl


 


Example :


Methyl cyanide to acetaldehyde preparation by stephen’s reaction is as follows:


 


CH3CN + 2[H] ---(SnCl2/HCl)----------> CH3-CH-NH ---(H2O)----> CH3CHO + NH3

7 years ago
RAVEENDRA HULLOLIKAR
8 Points
										
Sir, can you explain with reaction mechanism involved  in reduction of azo compounds using stannous(II)chloride in presence of concentrated hydrochloric acid.
2 years ago
RAVEENDRA HULLOLIKAR
8 Points
										
Kindly mention your reference book
 
 
2 years ago
Animesh Sau
19 Points
										In the 1st step of Stephen reaction Stannus chloride accept 2 Cl- anion and eject 2 e .This 2 e react with Cyanide to form di anionic intermediate which upon addition of H+ produce aldehyde
										
one month ago
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