Spectrometric and polarographic study of the ketol condensation of 3-thiohydroxy-2-oxopropanoic acid in alkaline solution
作者:M.B. Fleury、J. Tohier、N. Platzer
DOI:10.1016/0040-4020(82)80084-7
日期:1982.1
The product of two-electron reduction of 3-thiohydroxy 2-oxo propanoic 1 acid is either β-mercaptolactate or pyruvate when the CS cleaved. The first pathway predominates in acidic media, the second in slightly basic media. Comparison of the polarographic and UV and NMR spectrometric behaviour of 1 with that of thioether C2H5SCH2COCO2H 2 indicates that, in the second dissociation step for 1 (pk2
当C 3 S裂解时,3-硫羟基2-氧代丙酸1酸的两电子还原产物是β-巯基乳酸或丙酮酸。第一条途径主要在酸性介质中,第二条主要在弱碱性介质中。极谱和UV和NMR光谱的行为的比较1与硫醚Ç 2 ħ 5 SCH 2 COCO 2 ħ 2表示的是,在用于第二解离步骤1(PK 2 = 9.6),在动力学发生了可控制的硫醇根阴离子的形成,该硫醇根阴离子缓慢转化为环境中的碳负离子。分离出酮醇二聚体产物,为钠盐,其结构通过13 C NMR研究。在基本碱性介质中形成环境碳负离子的能力在必要的生物学过程中至关重要。