Products of reaction between tetrabromo-substituted ortho- and para-hydroxybenzoic acids and sodium nitrite in CH3COOH
摘要:
The reaction of 2,3,5,6-tetrabromo-4-hydroxybenzoic acid with a 10-fold excess of NaNO2 in the glacial acetic acid at 20A degrees C affords tetrabromonitrosophenols whose further transformations under the reaction conditions leads to the formation of a mixture of 2,4,5,6-tetrabromo-p-quinone diazide and tetrabromo-p- and -o-nitrophenols in the molar ratio 37: 2: 1. Under similar conditions the 3,4,5,6-tetrabromo-2-hydroxybenzoic acid is converted into a mixture of 3,4,5,6-tetrabromo-o-quinone diazide with the same nitrophenols in the ratio 13: 1: 3. The reaction of sodium 2,3,5,6-tetrabromo-4-hydroxy-benzoate with NaNO2 in dilute acetic acid resulted in a quantitative yield of tetrabromo-p-quinone monooxime.
Displacement of an acetamido- and a nitro-group during bromination of an aromatic compound
作者:Charles R. Harrison、J. F. W. McOmie
DOI:10.1039/j39660000997
日期:——
Bromination of 4-acetamido-3-nitroanisole has been found to give 2,3,4,5-tetrabromoanisole. Possible mechanisms for this remarkable reaction are suggested.