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钠盐含量的测定在生产实践中是经常遇到的难题之一。经典的醋酸铀酰法,试剂价格昂贵,操作要求严格,且受钾、锂、硅等的干扰。古老而烦杂的差减法,事倍功半且误差甚大。Reeve等人发现,某些α-甲氧基苯乙酸有用作钠分析试剂的可能,引起了国内外一些化学工作者的重视和关注。苯醛或某些卤代苯醛与溴仿、甲醇在碱催化下经一步缩合,可生成相应的苯基或卤代苯基-α-甲氧基乙酸的酯或钾盐,其反应机理据认为是;
Determination of sodium content in production practice is one of the problems often encountered. The classic uranyl acetate method, reagent expensive, strict operation requirements, and by potassium, lithium, silicon and other interference. The ancient and complex subtraction method, with less effort and error is very large. Reeve et al. Found that some α-methoxyphenylacetic acid can be used as a sodium analysis reagent, arousing the attention and attention of some chemical workers at home and abroad. Phenylaldehyde or some halobenzaldehyde and bromoform, methanol in the base catalyzed by one-step condensation, can generate the corresponding phenyl or halogenated phenyl-α-methoxy acetic acid ester or potassium salt, the reaction mechanism according to Think