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Consiglio Nazionale delle Ricerche
|Keywords:||Chemistry;Materials Science;Physics and Astronomy|
|Citation:||Acta Crystallographica Section E: Structure Reports Online. Vol.68, No.9 (2012)|
|Abstract:||The title compound, C 11 H 11 Br 2 NO 4 ·0.5H 2 O, was prepared by an electrophilic bromination of N-acetyl-l-tyrosine in acetonitrile at room temperature. The two independent molecules do not differ substanti-ally and a molecule of water completes the asymmetric unit. The synthesis of the title compound does not modify the stereochemical center, as shown by the absolute configuration found in this crystal structure. Comparison with the non-bromo starting material differs mainly by rotation features. For instance the H(methine) - C(chiral center) - C(methyl-ene) - C(ipso) is 173.0 (2)° torsion angle in one molecule and 177.3 (2)° in the other, indicating a trans arrangement. This is in contrast with approximately 50° in the starting material. A short Intermolecular Br⋯Br separation is observed [3.2938 (3) Å]. The molecules in the crystal are connected via a network of hydrogen bonds through an N - H⋯O hydrogen bond between the hydroxy group of the phenol of the tyrosine and the N - H of the amide of the other molecule and an O - H⋯O hydrogen bond between the hydroxy group of the carboxylic acid and the oxygen of the carbonyl of the amide.|
|Appears in Collections:||Scopus 2011-2015|
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