作者:Gerasimos M. Tsivgoulis、Panayiotis V. Ioannou
DOI:10.1007/s00706-012-0867-5
日期:2012.12
AbstractThe esterification equilibrium constants between CD3OD and five arsonic acids (methyl, pentyl, phenyl, 2,3-dipalmitoyloxypropyl, and 2,3,4-tripalmitoyloxybutyl) and one arsinic acid (cacodylic acid) were measured in the solvent system CDCl3/CD3OD at 25.0 °C. Equilibrium concentrations of the diester, monoester, and free acid for each compound were calculated from the integrations of the corresponding
摘要在溶剂系统CDCl 3中测量了CD 3 OD与五种砷酸(甲基,戊基,苯基,2,3-二棕榈酰氧基丙基和2,3,4-三棕榈酰氧基丁基)和一种砷酸(二十二烯酸)之间的酯化平衡常数。/ CD 3 OD在25.0°C下。由相应的1 H NMR峰的积分计算出每种化合物的二酯,单酯和游离酸的平衡浓度。发现砷酸的有机部分的性质基本上不影响所测量的平衡常数,其对于K 1和K 2分别为约0.114和0.014 。但是,平衡常数K 1个ca草酸为0.053。二酯和单酯非常容易水解,特别是即使在少量水的存在下,二酯也能被广泛水解。因此,预期砷酸或砷酸与一元醇的酯在细胞内的浓度非常低,这一结论可能引起“关于砷细菌的争论”。 图形概要