Aldehydes and Ketones - Result Question 64

75. Write the structure of the major organic product expected from the following reaction.

$(1992,1 M)$

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Solution:

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(Cannizzaro reaction)

In cross-Cannizzaro reaction, methanal is always reduced.

<img src=“https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/e43d70c5-5fc0-43ca-baef-87ec98804d00/public"width="400">

II is less stable than I because II is less substituted enol. Acetone has greater enol content than ethanal

<img src=“https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/fd6f9991-0e13-4842-afbd-f2a61d337e00/public"width="400">

Therefore, overall enol-content order is $D < C < B < A $



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