Visualizing Curly Arrow Electron Movement (IMAGE) ARC Centre of Excellence in Exciton Science Caption The Diels-Alder reaction is important in the synthesis of all sorts of pharmaceuticals, including vitamin D. But how does it work? UNSW researchers show that it involves the splitting of electron pairs. Credit T. Schmidt Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.