4,4′-Dihydroxy-3,3′,5,5′-tetramethoxyazodioxybenzene: an unexpected dimer formed during hydroxylamine extractions of wheat flour
作者:R.E. Asenstorfer、D.J. Mares
DOI:10.1016/j.tet.2006.06.117
日期:2006.9
Neutral hydroxylamine extracts of wheat contained a product that was colourless at pH < 5(lambda(max) 340 nm) and yellow at pH > 9 (lambda(max) 400 nm). ESI-MS showed a major ion m/z 184.0 and a possible parent ion m/z 367.2 (MH(+)) suggesting that the product resulted from the reaction of 2,6-dimethoxy-p-quinone with hydroxylamine. However, mass spectral and other spectroscopic data indicated that the compound was neither of the 2,6-dimethoxy-p-quinone oximes. A product with identical absorbance, mass spectrum, electrophoretic mobility and HPLC retention time as the pigment from hydroxylamine extracts of flour was observed amongst the reaction products of hydroxylamine and 1,4-dihydroxy-2,6-dimethoxybenzene. The structure of this product was identified by NMR, 2D NMR and IR as 4,4'-dihydroxy-3,3',5,5'-tetramethoxyazodioxybenzene. (c) 2006 Elsevier Ltd. All rights reserved.