Question

What is pinacol pinacolone rearrangement???

Answer 1

Answer:

Explanation:The pinacol pinacolone rearrangement process takes place via a 1,2-rearrangement as discussed earlier. This rearrangement involves the shift of two adjacent atoms. This reaction is a result of the work of the German chemist William Rudolph Fittig who first described it in the year 1860.

Answer 2

Answer:

Pinacol Rearrangement

In the conversion that gave its name to this reaction, the acid-catalyzed elimination of water from pinacol gives t-butyl methyl ketone.

Mechanism of the Pinacol Rearrangement

This reaction occurs with a variety of fully substituted 1,2-diols, and can be understood to involve the formation of a carbenium ion intermediate that subsequently undergoes a rearrangement. The first generated intermediate, an α-hydroxycarbenium ion, rearranges through a 1,2-alkyl shift to produce the carbonyl compound. If two of the substituents form a ring, the Pinacol Rearrangement can constitute a ring-expansion or ring-contraction reaction.

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