Deuterium NMR spectroscopy is a versatile and economical tool for monitoring reaction kinetics in ionic liquidsElectronic supplementary information (ESI) available: Figs. S1–6: NMR stack plots and kinetic traces. See http://www.rsc.org/suppdata/cc/b1/b108864e/
observed, which is different than the normal H/D kinetic isotope effects (KIEs) usually observed for polar aromatics. This result indicated that the oxidation started by photo-induced hvb+ can be the rate-determiningstep.
在TiO 2水溶液中弱极性芳族化合物的光催化羟基化反应中,观察到一系列的反向H / D KIE为0.7-0.8,这与通常在极性芳族化合物中观察到的正常H / D动力学同位素效应(KIEs)不同。该结果表明,由光诱导的h vb +开始的氧化可以是速率确定步骤。
Kinetics of MTO-Catalyzed Olefin Epoxidation in Ambient Temperature Ionic Liquids: UV/Vis and 2H NMR Study MTO= methyltrioxorhenium.
作者:Gregory S. Owens、Armando Durazo、Mahdi M. Abu-Omar
reaction of olefin with dpRe (k4) and the slow step to the analogous reaction with mpRe (k3). In most of the tudied ionicliquids, k4 approximately 5 x k3. 2H NMR experiments conducted with [D3]dpRe under non-steady-state conditions confirm the speciation of the catalytic system in ionicliquids and assert the validity of the UV/Vis kinetics. Deuteriated alkenes were used to study the catalytic epoxidation
研究了从离子液体中甲基三氧杂or(MTO)的过氧配合物到烯烃的氧原子转移动力学。在360 nm处通过UV / Vis监测烯烃到环氧化物的非催化转化,单过氧or(mpRe)和二过氧or(dpRe)络合物在其中吸收。通过MTO和尿素过氧化氢(UHP)在无水THF中的反应原位制备无水和无过氧化物的dpRe。观察到的双指数时间曲线与动力学模型相结合,可以将快速步骤分配给烯烃与dpRe(k4)的反应,将缓慢步骤分配给与mpRe(k3)的类似反应。在大多数的离子液体中,k4约为5 x k3。在非稳态条件下用[D3] dpRe进行的2H NMR实验证实了离子液体中催化体系的形态,并证明了UV / Vis动力学的有效性。用氘代烯烃通过2 H NMR光谱研究烯烃的催化环氧化和二羟基化。在几种离子液体中,α-甲基苯乙烯的k4值比乙腈中的k4值高一个数量级。尽管烯烃环氧化的速率不受离子液体阳离子的性质影响,但观
WO2007/62119
申请人:——
公开号:——
公开(公告)日:——
Deuterium NMR spectroscopy is a versatile and economical tool for monitoring reaction kinetics in ionic liquidsElectronic supplementary information (ESI) available: Figs. S1–6: NMR stack plots and kinetic traces. See http://www.rsc.org/suppdata/cc/b1/b108864e/
作者:Armando Durazo、Mahdi M. Abu-Omar
DOI:10.1039/b108864e
日期:2002.1.14
Time-resolved 2H NMR spectroscopy is used to monitor the progress of and gain kinetic information for a variety of reactions in different ionic media.