作者:J. Richard Heys、Mark E. Powell、Don E. Pivonka
DOI:10.1002/jlcr.887
日期:2004.11
The utility of Raman spectroscopy for noninvasive, real-time monitoring of a range of tritium gas labeling reactions has been investigated, using deuterium gas as a model in most cases. Reaction types include organoiridium-catalyzed heteroatom-directed exchange (HDE), olefin hydrogenation and catalytic aryl dehalogenation. Five examples of HDE reactions with several different substrate types were monitored by observation of Raman vibrational bands sensitive to the isotopic substitutions. Changes in peak intensities and/or frequencies associated with the course of labeling are clearly observable at concentrations and reaction scales typical of tritium gas reactions. Similarly, Raman bands sensitive to the chemical changes that occur during catalytic deuterogenation of an olefin and to catalytic deuterium–bromine exchange of an aryl bromide were successfully monitored. This methodology can provide unprecedented real-time information, otherwise difficult to obtain, over the course of such reactions. Copyright © 2004 John Wiley & Sons, Ltd.
通过在大多数情况下以氘气作为模型,研究了拉曼光谱在非侵入性、实时监测一系列氚气标记反应中的应用。反应类型包括有机铱催化的杂原子导向交换(HDE)、烯烃加氢和催化芳基脱卤。通过观察对同位素取代敏感的拉曼振动谱带,监测了五种不同底物类型的HDE反应。在典型的氚气反应浓度和反应规模下,可以清晰地观察到与标记过程相关的峰强度和/或频率的变化。同样,成功监测了对烯烃催化氘化过程中化学变化敏感的拉曼谱带,以及对芳基溴化物催化氘-溴交换过程中化学变化敏感的拉曼谱带。这种方法能够在这些反应过程中提供前所未有的实时信息,否则这些信息是难以获得的。版权所有 © 2004 John Wiley & Sons, Ltd。