Abstract
Nitration of α-resorcylic acid (3,5-dihydroxybenzoic acid) to 3,5-dihydroxy-2-nitrobenzoic acid (1) and 3,5-dihydroxy-4-nitrobenzoic acid (2), their separation, and crystallization is described. Crystal structures of 1, 1 · 3H2O, and 2 were determined by X-ray single-crystal diffraction analysis and compared with DFT-calculated structures. An intramolecular hydrogen bond between the nitro group and o-hydroxyl group(s) occurs in all investigated structures. Intermolecular hydrogen bonds and π···π stacking interactions determine the molecular packing. Additionally, N···O interactions have a crucial role in arrangement of the molecules in the crystal structures of 1 and 2. DFT calculations in the gas phase and in the solution reveal that minor product 2 is a more stable regioisomer than 1, the major product in the nitration reaction.
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This research was supported by GlaxoSmithKline Research Centre Zagreb Ltd. and by the Ministry of Science, Education and Sports of the Republic of Croatia (Grant No. 119-1193079-1084).
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Čorić, I., Milić, D., Matković-Čalogović, D. et al. Synthesis and crystal structures of two isomeric nitro-α-resorcylic acids. Struct Chem 20, 73–80 (2009). https://doi.org/10.1007/s11224-008-9394-8
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DOI: https://doi.org/10.1007/s11224-008-9394-8