Abstract
A MIXTURE of 400 mgm. of o-aminoveratric acid (prepared by the method of Pschorr and Sumuleanu1), 100 mgm. of red phosphorus and 8 ml. of hydriodic acid (sp. gr. 1.7) was heated in a sealed tube at 100° for eight hours and then at 105° for two hours. The hydriodic acid salt of 2-amino-3,4-dihydroxybenzoic acid crystallized on cooling. After filtration, this product was recrystallized from a small amount of hydriodic acid containing water and obtained as macroscopic prismatic needles (m.p. 220°; found: N, 4.29; C7H8O4NI requires N, 4.71 per cent). The hydriodide of dioxyanthranilic acid was easily dissociated by washing with a larger amount of water, and the free acid was recrystallized from alcohol (m.p. 174°; found: N, 8.05; C7H7O4N requires N, 8.29 per cent).
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References
Pschorr and Sumuleanu, Ber. deut. chem. Ges., 32, 3405 (1899).
Swaminathan, Nature, 141, 830 (1938).
Kawashima, J. Biochem., 19, 149 (1947).
Henderson, J. Biol. Chem., 178, 1005 (1949).
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MAKINO, K., ITOH, F. & NISHI, K. Dihydroxyanthranilic Acid as a Precursor of Nicotinic Acid. Nature 167, 115–116 (1951). https://doi.org/10.1038/167115a0
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DOI: https://doi.org/10.1038/167115a0
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