allowing effective control of the end of the reaction and identification of all phosphorylated intermediate species, which enabled us to propose a reaction mechanism. Optimized experimental conditions were applied to the preparation of biological relevant aminoalkyl-HMPPs. A preliminary study of the complexation to hydroxyapatite (bone matrix) was carried out in order to verify its lower affinity towards
Investigation of Physical Properties of Disodium Etidronate Tetrahydrate and Application of Phosphorus K-Edge X-Ray Absorption Near-Edge Structure Spectroscopy
We investigated the physical properties of disodium etidronate tetrahydrate crystal, form I. Methods We used X-ray powder diffraction (XRPD), thermal analysis, dynamic vapor sorption (DVS), X-ray single crystal structure analysis, and phosphorus K-edge X-ray absorption near-edge structure (XANES) spectroscopy for the first time. Results XRPD and thermal analyses demonstrated that form I was dehydrated
目的 依替膦酸二钠是一种二膦酸盐化合物,广泛用于治疗骨质疏松症和佩吉特病等骨骼疾病。我们研究了依替膦酸二钠四水合物晶体 I 型的物理性质。 方法 我们首次使用 X 射线粉末衍射 (XRPD)、热分析、动态蒸气吸附 (DVS)、X 射线单晶结构分析和磷 K 边 X 射线吸收近边结构 (XANES) 光谱. 结果 XRPD 和热分析表明,形式 I 被脱水并转化为无定形形式,转化为结晶形式 II,最后通过加热转化为形式 III。DVS测量表明,无定形、II型和III型通过加湿再水合为I型,即使在0%相对湿度下,I型也很稳定。这些结果表明,I 型在环境条件下是最稳定的固态,适合作为用于固体制剂制造的 API。磷 K 边缘 XANES 光谱在 I 型、无定形形式和 II 型之间存在差异,这可能归因于磷酸盐部分和钠离子之间的配位键方案的差异。 结论 获得的有关物理性质的信息对于依替膦酸二钠固体制剂的制造至关重要。XANES
Chuiko, Alexey; Philonenko, Ludmila; Borisevich, Anatoly, Phosphorus, Sulfur and Silicon and the Related Elements, 1996, vol. 111, p. 66
salt) by the reaction of acetic acid with phosphorustrichloride/ phosphorus acid in methanesulfonic acid was studied and optimized. We showed that it is enough to use 3.2 equivalents of the phosphorustrichloride and there is no need to apply phosphorus acid. In the two-step variation of the synthesis, the acetyl chloride was formed by the reaction of acetic acid with phosphorustrichloride, thionyl chloride