Kinetic characterization of a transient reaction by degeneration of the precursor mechanism: Application to the synthesis of 3,4-diazabicyclo[4.3.0]- non-2-ene
作者:H. Delalu、J. Berthet、R. Metz、M. Elkhatib
DOI:10.1002/kin.20072
日期:2006.5
with the initial formation of a diazene-type intermediate, which is converted by hydroxide ions into 3,4-diazabicyclo[4.3.0]non-2-ene. Because it was not possible to follow the rate of change of the intermediate concentration, to determine the kinetics of 3,4-diazabicyclo[4.3.0]non-2-ene formation, a procedure based on the degeneration of the precursor process was adopted. An appropriate mathematical treatment
已通过 GC 和 HPLC 在 pH 10.5 和 13.5 之间研究了氯胺对 N-氨基-3-氮杂双环[3.3.0]辛烷的氧化速率。二级反应表现出特定的酸催化作用。N,N'-azo-3-azabicyclo[3.3.0]octane 或 3,4-diazabicyclo[4.3.0]non-2-ene 的形成取决于 pH、浓度和温度。在碱性介质中,观察到 3,4-二氮杂双环[4.3.0]non-2-ene 的排他性形成。动力学研究表明,氯胺氧化 N-氨基-3-氮杂双环[3.3.0]辛烷是一个多步骤过程,最初形成二氮烯型中间体,然后由氢氧根离子转化为 3,4-二氮杂双环[ 4.3.0]非-2-烯。因为不可能跟踪中间浓度的变化率,以确定 3,4-二氮杂双环[4.3.0]non-2-ene 形成的动力学,采用了基于前体工艺退化的程序。适当的数学处理可以对在给定 pH 区间内观察到的所有现象进行定量解释。确定激活参数。©