The 2-hydroxycarbazolecarboxylic acid used in the preparation of Naphtol AS-LB has been shown to be the 1-carboxylic acid and not the 3-carboxylic acid as assumed earlier. Naphtol AS-LB is therefore the p-chloro-anilide of 2-hydroxycarbazole-1-carboxylic acid.
B. S. Joshi, V. N. Kamat and D. F. Rane, J. Chem. Soc. C, 1969, 1518 DOI: 10.1039/J39690001518
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