Figure 11.

(a) Piperazic acid mixture, and (b) apparatus for enantiomeric upgrading by recorded crystallisation. The thermostat slowly adjusts the temperature of the jacketed flask containing the piperazic acid over several hours. (c) A digital camera records images of the flask as it crystallises over 12 hours. A dark background allows the precipitation to be observed. (d) An example of the images captured by the camera. These are stored on the computer for later assembly into a video sequence (see Supporting Information File 1).