trihydroxamate-based siderophore desferal (DFB) revealed that the hydrolytic stability sequence of the compounds is generally: BHA > ODHA > MDHA > DFB > AHA > SDHA. An excess acidity analysis reveals that the reaction involving a pre-equilibrium protonation was followed by a rate determining A-2 type nucleophilic attack of water molecule on the protonated substrate. An attempt has been made to study protonation
一些二异羟
肟酸 HOHNOC–(
CH2)n–CONHOH
水解的动力学研究(n = 0,草酰,[O
DHA];n = 1
丙二酸 [M
DHA];n = 2,
琥珀酸,[S
DHA] 二异羟
肟酸)据报道,在含
水无机酸中。将动力学数据与简单单异羟
肟酸(乙酰异羟
肟酸 [AHA] CH3CONHOH、苯异羟
肟酸 [
BHA] C6H5CONHOH)和天然三异羟
肟酸基
铁载体去
铁醛 (DFB)
水解的动力学数据进行比较,表明化合物一般为:
BHA > O
DHA > M
DHA > DFB > AHA > S
DHA。过量酸度分析表明,涉及平衡前质子化的反应之后是
水分子对质子化底物的 A-2 型亲核攻击速率决定。已经尝试研究质子化平衡。