Utilizing on- and off-line monitoring tools to follow a kinetic resolution step during flow synthesis.

In situ reaction monitoring tools offer the ability to track the progress of a synthetic reaction in real time to facilitate reaction optimization and provide kinetic/mechanistic insight. Herein, we report the utilization of flow NMR, flow IR, and other off-line spectroscopy tools to monitor the progress of a flow chemistry reaction. The on-line and off-line tools were selected to facilitate the stereoselective kinetic resolution of a key racemic monomer, which lacked a chromophore, making conventional reaction monitoring difficult.