SDS of cas: 33216-52-3. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 3,4,5-Trichloropyridine, is researched, Molecular C5H2Cl3N, CAS is 33216-52-3, about Use and qualification of primary and secondary standards employed in quantitative 1H NMR spectroscopy of pharmaceuticals.
Standards are required in quant. NMR (qNMR) to obtain accurate and precise results. In this study acetanilide was established and used as a primary standard Six other chems. were selected as secondary standards: 3,4,5-trichloropyridine, dimethylterephthalate, maleic acid, 3-sulfolene, 1,4-bis(trimethylsilyl)benzene, and 1,3,5-trimethoxybenzene. The secondary standards were quantified using the primary standard acetanilide. A protocol for qualification and periodic checks of these secondary standards was developed, and used for evaluation of the stability of the compounds Periodic monitoring of purity was performed for several years. The purity was higher than 99% for all secondary standards All standards maintained the initial purity during the time period of monitoring, with very small variations in purity (0.3-0.4%). The selected secondary standards were shown to be suitable qNMR standards and that periodic requalification of the standards by qNMR ensures reliable anal. results. These standards were used in the authors’ laboratory for compliance testing of pharmaceutical active substances and approved medicinal products as well as for anal. of suspected illegal medicines. In total more than 1000 samples were tested using both internal and external standardization and examples are given.
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Reference:
Bromide – Wikipedia,
bromide – Wiktionary