Dienone–phenol rearrangement
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Dienone-phenol_rearrangement_scheme.svg/220px-Dienone-phenol_rearrangement_scheme.svg.png)
The dienone–phenol rearrangement[1] is a reaction in organic chemistry first reported in 1921 by Karl von Auwers and Karl Ziegler. A common example of dienone–phenol rearrangement is 4,4-disubstituted cyclohexadienone converting into a stable 3,4-disubstituted phenol in presence of acid. A similar rearrangement is possible with a 2,2-disubstituted cyclohexadienone to its corresponding disubstituted phenol. Usually this type of rearrangement is spontaneous unless a dichloromethyl group is present at the 4th position or the process is otherwise blocked.[2]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/26/2%2C2-disubstituted_cyclohexadienone.svg/220px-2%2C2-disubstituted_cyclohexadienone.svg.png)
Reaction mechanism
The reaction mechanism of 4,4-disubstituted cyclohexadienones to 3,4-disubstituted phenol is illustrated here.
The migration tendency for the two different groups (R) present at either 4,4 position or 2,2 position can be determined by comparing the relative stability of the intermediate
References
- ISBN 978-3-030-50864-7.
- ISBN 9780470638859.
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- PMID 18861812.
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