This reaction can be used to determine the structure of amines especially in complex molecules such as alkaloids.
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Friday, January 24, 2020
Explain Exhaustive alkylation and Hoffmann Elimination.
Then reaction of amines with excess of alkyl halides to form a quaternary ammonium salt is known as exhaustive alkylation and if the alkyl group is methyl, then it is known as exhaustive methylation .
The exhaustive methylation of amine followed by treatment with moist silver oxide (AgO + O2--> AgOH) and subsequent heating to form alkene is known as Hoffmann elimination.
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(2) Write Dehydration and ring expansion mechanism
of 1-cyclobutylethanol in the presence of con H2SO4.
(6) How to write dehydration and
ring expansion mechanism of 2-cyclopentylethanol?
(7) Write the major and minor product of hydration of 1-Methylcyclopent-1-ene in acidic medium?
(7) Write the major and minor product of hydration of 1-Methylcyclopent-1-ene in acidic medium?
What is Imine-Enamine tautomerism?
An imine is a compound that contains a -C=NH bond. It
is homologous of -C=O. And Imime form is just similar to keto form and Enamine
form is just similar to Enol form . The Imine-Enamine tautomerism is due to the
migration of alpha hydrogen from one polyvalent atom to another to form Enamine
thus Imines can be converted into enamines.
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Thursday, January 23, 2020
How to write Bechmann rearrangment mechanism involved formation of oxime of cyclohexane and transformation into cyclic amide caprolactam?
This reaction proceed through formation of of oxime cyclohexane by Nucleophilic Addition reaction and followed by Bechmann rearrangment to form desired product Caprolactam , the whole Mechanism given as.
Arrange in correct order of basic Character of aniline, pyrrol, pyridine and piperidine?
We know that aliphatic amines are more basic than aromatic amines due to non delocalized of lone pair of nitrogen atom hence piperidine (option IV) is more basic than others
Pyridine is more basic than aniline and pyrrol because is lone pair of nitrogen is does not involved in pi cloud formation that means it is localised while pryrrol is less basic than aniline because is lone pair involved in pi cloud formation of pyrrol ring
Hence correct basic order is (iV) >(iii)>(I)>(ii)
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