In this example, ReactIR is able to identify key intermediates and show that a coupling agent generates highly reactive acyl imidazolium intermediates, which in turn, react to form amide-group containing compounds with little or no epimerization. While sampling for offline HPLC identified the final product, offline sampling did not detect these key intermediates.
Transient Intermediate Detection in Action
Eliminate Hold Time
In a multi-step batch process, it is important to move a synthesized intermediate compound to the next phase of the process and avoid hold times, which can be accompanied by decomposition. In the example presented in this video, the scientists needed to form an enantiomer-pure product from an enantiomer-pure reagent. The stereogenic center of the product is unstable and epimerizes. To achieve their goals, it was necessary to carefully control the reaction so that the levels of both the pure enantiomer product and the unwanted impurity were both achieved. In situ FTIR measurement of the conversion of starting material to product captured the end point of the reaction, and eliminated the hold time incurred from offline HPLC analysis. Product yield and purity targets were met and the time required for this process was reduced.
ReactIR
In-situ FTIR spectrometers enable scientists to gain insight into their reactions and processes in a wide range of applications. Optimize reaction variables with inline FTIR instruments.
Reaction Insight from Every Experiment
This paper presents five examples taken from recent journal articles in which HPLC alone was not sufficient to provide the insight scientists needed. In all cases, in situ analytics complemented HPLC analysis resulting in improved synthesis steps.
