论文部分内容阅读
鉴定有机硼化合物,常常要测定化合物中的硼含量。氧瓶分解测定法最为简便快速,但因有机硼化合物在氧瓶中不能达到完全燃烧[1],因而有时甚至导致分析值的严重偏低(由于样品燃烧时在不同程度上形成不溶于酸、碱和水的碳化硼所致[2])。因此,有人用相当麻烦的生成Ag_2B_(12)H_(12)的重量法来测定B_(12)H_(12)~(2-)类型化合物[3]。我们则用酸量法简便地测定了另两种类型化合物——四氢硼酸和八氢三硼酸的季铵盐和碱金属盐[4]。本文在此反应原理的基础上,探讨了酸解集氢测定这两类型化合物阴离子中负氢的新方法。其反应原理是:四氢硼酸和八氢三硼酸的季铵盐在与骏发生复分解反应过程中分别生成HBH_4和HB_3H_8,而这两种酸在室温下都能迅速地被水解生成H_3BO_3并放出氢气。其总反应式是:
Identification of organoboron compounds, often to determine the boron content of compounds. Oxygen vial decomposition assay is the easiest and fastest, but due to the organoboron compound can not achieve complete combustion in oxygen bottles [1], and sometimes even lead to the severity of the analysis value is low (due to combustion of the sample to varying degrees, the formation of insoluble acid, Alkali and water caused by boron carbide [2]). Therefore, the B 12 H 12 (2) type compound [3] has been determined by a rather troublesome gravimetric method for the formation of Ag 2 B 12 H 12. We have also used the acid number method to easily determine the other two types of compounds - the quaternary ammonium and alkali metal salts of tetrahydroborate and octahydrotribo [4]. In this paper, based on the reaction principle, the new method for the determination of negative hydrogen in the anions of the two types of compounds by hydrogenolytic hydrogenation was discussed. The reaction principle is: Tetraboronic acid and octahydrovinic acid quaternary ammonium salt in the methotrexate decomposition process were generated HBH_4 and HB_3H_8, and these two acids at room temperature can be rapidly hydrolyzed to generate H_3BO_3 and release hydrogen . The total reaction is: