When phenol is treated with chloroform (CHCl3) in presence of sodium hydroxide (NaOH) to produce salicylaldehyde ( ortho Hydroxybenzaldehyde) is known as Reimer Tiemann,s Reaction.
This reaction is actually formylation (Addition of -CHO group) of phenol at ortho position.
Short Mechanism:-
The reaction in which Phathalimide is treated with sodium hydroxide, haloalkane to produce primary aliphatic amine is known as Gabriel Phthalimide Reaction.
Pure primary amine is obtained in this reaction as its separation is easy.
NOTE-Aryl Amine can not prepared by this reaction as aryl halide does not undergo nucleophylic substitution.
The reaction in which carbonyl group/ compound is first treated with hydrazine and than treated with base to produce alkane is called Wolf Kishner,s Reduction Reaction. In this reaction C=O group is converted into -CH2-group.
The reaction in which the carbonyl compound (having no alpha hydrogen) is treated with base (NaOH or KOH) to produce alcohol and Carboxylate ion is called Cannizzaro’s reaction.
The cannizzro,s reaction is given by the aldehydes which has no alpha hydrogen.
The aldehyde oxidizes to carboxylate ion and reduced to alcohol.
Cannizzaro’s reaction is disproportionation reaction.
The reaction in which same molecule oxidizes and reduced simultaneously is called disproportionation reaction..
Question:- Which compounds gives Cannizzaro’s reaction out of the following compounds and why?
A
B
C.
D.
Answer:-Compounds A and C gives Cannizzaro’s reaction because they have absence of alpha hydrogen atom.
CHEMIGOD 