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Curtius and Hofmann Rearrangements

Which of the ...

Question

Which of the following will not give Hoffmann bromide reaction?

A

C H_{3} - O | | C - N H_{2}

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B

P h - O | | C - N H_{2}

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C

C H_{3} - O | | C - N H - B r

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D

P h - O | | C - N H - P h

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Solution

The correct option is B $P h - O | | C - N H - P h$
$P h - O | | C - N H - P h secondary amide B r_{2} / N a O H - ------ \to No reaction$

Hoffmann bromide reaction $:$
The above mentioned compound is not primary amide but a secondary amide $.$ The reaction takes place by a formation of iso cyanide which will not take place in the reaction $.$ Hence it does not react or give a primary amine $.$
Option D is the answer.

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Product (B) is?

Which of the following is not correct?

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Curtius and Hofmann Rearrangements

Standard XII Chemistry

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