Ullmann Reaction of Picryl Bromide in the Presence of Ultrasound
- 1 January 1991
- journal article
- research article
- Published by Taylor & Francis in Synthetic Communications
- Vol. 21 (2) , 293-305
- https://doi.org/10.1080/00397919108020824
Abstract
Ultrasonic irradiation was found to promote the Ullmann coupling of picryl bromide at or below room temperature. In the presence of excess copper, a long-lived intermediate is formed that is quenched upon work-up affording variable mixtures of trinitrobenzene and picric acid.Keywords
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